[clang-tools-extra] Remove remaining uses of llvm::Optional (NFC)

This patch removes the unused "using" declaration and removes #include
"llvm/ADT/Optional.h".

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

clang-tools-extra/clang-apply-replacements/lib/Tooling/ApplyReplacements.cpp

@@ -23,7 +23,6 @@
 #include "clang/Tooling/DiagnosticsYaml.h"
 #include "clang/Tooling/ReplacementsYaml.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"

clang-tools-extra/clang-include-fixer/find-all-symbols/FindAllSymbols.cpp

@@ -16,7 +16,6 @@
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
 #include "clang/Tooling/Tooling.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/Support/FileSystem.h"
 #include <optional>
 

clang-tools-extra/clang-tidy/ClangTidyCheck.h

@@ -13,7 +13,6 @@
 #include "ClangTidyOptions.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/Basic/Diagnostic.h"
-#include "llvm/ADT/Optional.h"
 #include <optional>
 #include <type_traits>
 #include <utility>

clang-tools-extra/clang-tidy/NoLintDirectiveHandler.cpp

@@ -19,7 +19,6 @@
 #include "clang/Basic/SourceManager.h"
 #include "clang/Tooling/Core/Diagnostic.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"

clang-tools-extra/clang-tidy/bugprone/ReservedIdentifierCheck.h

@@ -10,7 +10,6 @@
 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_RESERVEDIDENTIFIERCHECK_H
 
 #include "../utils/RenamerClangTidyCheck.h"
-#include "llvm/ADT/Optional.h"
 #include <optional>
 #include <string>
 #include <vector>

clang-tools-extra/clang-tidy/bugprone/UncheckedOptionalAccessCheck.cpp

@@ -18,7 +18,6 @@
 #include "clang/Analysis/FlowSensitive/Models/UncheckedOptionalAccessModel.h"
 #include "clang/Analysis/FlowSensitive/WatchedLiteralsSolver.h"
 #include "clang/Basic/SourceLocation.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Error.h"
 #include <memory>
@@ -32,7 +31,6 @@ using ast_matchers::MatchFinder;
 using dataflow::UncheckedOptionalAccessDiagnoser;
 using dataflow::UncheckedOptionalAccessModel;
 using dataflow::UncheckedOptionalAccessModelOptions;
-using llvm::Optional;
 
 static constexpr llvm::StringLiteral FuncID("fun");
 

clang-tools-extra/clang-tidy/objc/NSInvocationArgumentLifetimeCheck.cpp

@@ -23,7 +23,6 @@
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Lex/Lexer.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include <optional>
 

clang-tools-extra/clang-tidy/performance/FasterStringFindCheck.cpp

@@ -10,7 +10,6 @@
 #include "../utils/OptionsUtils.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/Support/raw_ostream.h"
 #include <optional>
 

clang-tools-extra/clang-tidy/readability/ConstReturnTypeCheck.cpp

@@ -12,7 +12,6 @@
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Lex/Lexer.h"
-#include "llvm/ADT/Optional.h"
 #include <optional>
 
 using namespace clang::ast_matchers;

clang-tools-extra/clang-tidy/readability/FunctionCognitiveComplexityCheck.cpp

@@ -20,7 +20,6 @@
 #include "clang/Basic/DiagnosticIDs.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/SourceLocation.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/ErrorHandling.h"

clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.h

@@ -10,7 +10,6 @@
 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_IDENTIFIERNAMINGCHECK_H
 
 #include "../utils/RenamerClangTidyCheck.h"
-#include "llvm/ADT/Optional.h"
 #include <optional>
 namespace clang {
 namespace tidy {

clang-tools-extra/clang-tidy/readability/QualifiedAutoCheck.cpp

@@ -9,7 +9,6 @@
 #include "QualifiedAutoCheck.h"
 #include "../utils/LexerUtils.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include <optional>
 

clang-tools-extra/clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp

@@ -11,7 +11,6 @@
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/Lex/Lexer.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallString.h"
 #include <cctype>
 #include <optional>

clang-tools-extra/clang-tidy/utils/FileExtensionsUtils.h

@@ -11,7 +11,6 @@
 
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringRef.h"
 #include <optional>

clang-tools-extra/clang-tidy/utils/RenamerClangTidyCheck.h

@@ -13,7 +13,6 @@
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/FunctionExtras.h"
-#include "llvm/ADT/Optional.h"
 #include <optional>
 #include <string>
 #include <utility>

clang-tools-extra/clangd/AST.cpp

@@ -30,7 +30,6 @@
 #include "clang/Basic/Specifiers.h"
 #include "clang/Index/USRGeneration.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringRef.h"

clang-tools-extra/clangd/ClangdLSPServer.cpp

@@ -27,7 +27,6 @@
 #include "clang/Tooling/Core/Replacement.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/FunctionExtras.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"

clang-tools-extra/clangd/ClangdLSPServer.h

@@ -18,7 +18,6 @@
 #include "support/MemoryTree.h"
 #include "support/Path.h"
 #include "support/Threading.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/Support/JSON.h"
 #include <chrono>
 #include <cstddef>

clang-tools-extra/clangd/ClangdServer.cpp

@@ -39,7 +39,6 @@
 #include "clang/Tooling/CompilationDatabase.h"
 #include "clang/Tooling/Core/Replacement.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Error.h"

clang-tools-extra/clangd/ClangdServer.h

@@ -31,7 +31,6 @@
 #include "support/ThreadsafeFS.h"
 #include "clang/Tooling/Core/Replacement.h"
 #include "llvm/ADT/FunctionExtras.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include <functional>
 #include <memory>

clang-tools-extra/clangd/CodeComplete.cpp

@@ -57,7 +57,6 @@
 #include "clang/Sema/DeclSpec.h"
 #include "clang/Sema/Sema.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"

clang-tools-extra/clangd/CodeComplete.h

@@ -26,7 +26,6 @@
 #include "support/Path.h"
 #include "clang/Sema/CodeCompleteConsumer.h"
 #include "clang/Sema/CodeCompleteOptions.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include <functional>

clang-tools-extra/clangd/ConfigCompile.cpp

@@ -33,7 +33,6 @@
 #include "support/Logger.h"
 #include "support/Path.h"
 #include "support/Trace.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"

clang-tools-extra/clangd/Diagnostics.cpp

@@ -21,7 +21,6 @@
 #include "clang/Lex/Token.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseSet.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SmallString.h"

clang-tools-extra/clangd/Diagnostics.h

@@ -15,7 +15,6 @@
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseSet.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/JSON.h"

clang-tools-extra/clangd/FS.h

@@ -11,7 +11,6 @@
 
 #include "support/Path.h"
 #include "clang/Basic/LLVM.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/Support/VirtualFileSystem.h"
 #include <optional>

clang-tools-extra/clangd/GlobalCompilationDatabase.cpp

@@ -18,7 +18,6 @@
 #include "clang/Tooling/CompilationDatabase.h"
 #include "clang/Tooling/CompilationDatabasePluginRegistry.h"
 #include "clang/Tooling/JSONCompilationDatabase.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/ScopeExit.h"

clang-tools-extra/clangd/GlobalCompilationDatabase.h

@@ -16,7 +16,6 @@
 #include "clang/Tooling/ArgumentsAdjusters.h"
 #include "clang/Tooling/CompilationDatabase.h"
 #include "llvm/ADT/FunctionExtras.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringMap.h"
 #include <memory>
 #include <mutex>

clang-tools-extra/clangd/HeaderSourceSwitch.h

@@ -10,7 +10,6 @@
 #define LLVM_CLANG_TOOLS_EXTRA_CLANGD_HEADERSOURCESWITCH_H
 
 #include "ParsedAST.h"
-#include "llvm/ADT/Optional.h"
 #include <optional>
 
 namespace clang {

clang-tools-extra/clangd/Hover.cpp

@@ -38,7 +38,6 @@
 #include "clang/Basic/TokenKinds.h"
 #include "clang/Index/IndexSymbol.h"
 #include "clang/Tooling/Syntax/Tokens.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"

clang-tools-extra/clangd/IncludeFixer.cpp

@@ -33,7 +33,6 @@
 #include "clang/Sema/Sema.h"
 #include "clang/Sema/TypoCorrection.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"

clang-tools-extra/clangd/IncludeFixer.h

@@ -20,7 +20,6 @@
 #include "clang/Tooling/Inclusions/HeaderIncludes.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include <memory>

clang-tools-extra/clangd/ParsedAST.h

@@ -31,7 +31,6 @@
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Tooling/Syntax/Tokens.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include <memory>
 #include <optional>

clang-tools-extra/clangd/Protocol.h

@@ -27,7 +27,6 @@
 #include "index/SymbolID.h"
 #include "support/MemoryTree.h"
 #include "clang/Index/IndexSymbol.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/JSON.h"
 #include "llvm/Support/raw_ostream.h"

clang-tools-extra/clangd/SemanticHighlighting.cpp

@@ -27,7 +27,6 @@
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Tooling/Syntax/Tokens.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Casting.h"

clang-tools-extra/clangd/TUScheduler.cpp

@@ -65,7 +65,6 @@
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Tooling/CompilationDatabase.h"
 #include "llvm/ADT/FunctionExtras.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SmallVector.h"

clang-tools-extra/clangd/TUScheduler.h

@@ -18,7 +18,6 @@
 #include "support/MemoryTree.h"
 #include "support/Path.h"
 #include "support/Threading.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include <chrono>

clang-tools-extra/clangd/XRefs.cpp

@@ -51,7 +51,6 @@
 #include "clang/Tooling/Syntax/Tokens.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SmallSet.h"

clang-tools-extra/clangd/XRefs.h

@@ -19,7 +19,6 @@
 #include "index/SymbolID.h"
 #include "support/Path.h"
 #include "clang/AST/ASTTypeTraits.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/raw_ostream.h"
 #include <optional>

clang-tools-extra/clangd/index/BackgroundIndexStorage.cpp

@@ -10,7 +10,6 @@
 #include "index/Background.h"
 #include "support/Logger.h"
 #include "support/Path.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Error.h"

clang-tools-extra/clangd/index/FileIndex.cpp

@@ -29,7 +29,6 @@
 #include "clang/Index/IndexingOptions.h"
 #include "clang/Lex/Preprocessor.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"

clang-tools-extra/clangd/index/FileIndex.h

@@ -27,7 +27,6 @@
 #include "support/Path.h"
 #include "clang/Lex/Preprocessor.h"
 #include "llvm/ADT/DenseSet.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include <memory>

clang-tools-extra/clangd/index/Index.h

@@ -15,7 +15,6 @@
 #include "index/SymbolID.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/FunctionExtras.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/Support/JSON.h"
 #include <mutex>
 #include <optional>

clang-tools-extra/clangd/index/YAMLSerialization.cpp

@@ -20,7 +20,6 @@
 #include "index/SymbolLocation.h"
 #include "index/SymbolOrigin.h"
 #include "clang/Tooling/CompilationDatabase.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/StringSaver.h"

clang-tools-extra/clangd/refactor/Tweak.h

@@ -25,7 +25,6 @@
 #include "index/Index.h"
 #include "support/Path.h"
 #include "clang/Tooling/Core/Replacement.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Error.h"
 #include <optional>

clang-tools-extra/clangd/refactor/tweaks/DefineInline.cpp

@@ -32,7 +32,6 @@
 #include "clang/Tooling/Core/Replacement.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Casting.h"

clang-tools-extra/clangd/refactor/tweaks/DefineOutline.cpp

@@ -27,7 +27,6 @@
 #include "clang/Basic/TokenKinds.h"
 #include "clang/Tooling/Core/Replacement.h"
 #include "clang/Tooling/Syntax/Tokens.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Casting.h"

clang-tools-extra/clangd/refactor/tweaks/ExpandAutoType.cpp

@@ -11,7 +11,6 @@
 #include "clang/AST/Type.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/Basic/LLVM.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/Support/Error.h"
 #include <AST.h>
 #include <climits>

clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp

@@ -64,7 +64,6 @@
 #include "clang/Basic/SourceManager.h"
 #include "clang/Tooling/Core/Replacement.h"
 #include "clang/Tooling/Refactoring/Extract/SourceExtraction.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/SmallVector.h"

clang-tools-extra/clangd/refactor/tweaks/ObjCMemberwiseInitializer.cpp

@@ -18,7 +18,6 @@
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Tooling/Core/Replacement.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/Support/Casting.h"

clang-tools-extra/clangd/tool/Check.cpp

@@ -51,7 +51,6 @@
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Tooling/CompilationDatabase.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include <optional>

clang-tools-extra/clangd/tool/ClangdMain.cpp

@@ -29,7 +29,6 @@
 #include "support/ThreadsafeFS.h"
 #include "support/Trace.h"
 #include "clang/Format/Format.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/CommandLine.h"

clang-tools-extra/clangd/unittests/ClangdTests.cpp

@@ -25,7 +25,6 @@
 #include "clang/Sema/CodeCompleteConsumer.h"
 #include "clang/Tooling/ArgumentsAdjusters.h"
 #include "clang/Tooling/Core/Replacement.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"

clang-tools-extra/clangd/unittests/ConfigCompileTests.cpp

@@ -13,7 +13,6 @@
 #include "Feature.h"
 #include "TestFS.h"
 #include "clang/Basic/DiagnosticSema.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/SourceMgr.h"

clang-tools-extra/clangd/unittests/GlobalCompilationDatabaseTests.cpp

@@ -14,7 +14,6 @@
 #include "support/Path.h"
 #include "support/ThreadsafeFS.h"
 #include "clang/Tooling/CompilationDatabase.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"

clang-tools-extra/clangd/unittests/TestFS.cpp

@@ -10,7 +10,6 @@
 #include "URI.h"
 #include "support/Logger.h"
 #include "support/Path.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Path.h"
 #include <optional>

clang-tools-extra/clangd/unittests/TestFS.h

@@ -15,7 +15,6 @@
 #include "support/Path.h"
 #include "support/ThreadsafeFS.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/VirtualFileSystem.h"
 #include <optional>