[CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304954 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/StackProtector.cpp

@@ -14,13 +14,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/CodeGen/StackProtector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/BranchProbabilityInfo.h"
 #include "llvm/Analysis/EHPersonalities.h"
 #include "llvm/Analysis/OptimizationDiagnosticInfo.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/StackProtector.h"
 #include "llvm/CodeGen/TargetPassConfig.h"
 #include "llvm/IR/Attributes.h"
 #include "llvm/IR/BasicBlock.h"
@@ -29,6 +29,7 @@
 #include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/DebugLoc.h"
 #include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Dominators.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Instruction.h"
@@ -59,6 +60,7 @@ static cl::opt<bool> EnableSelectionDAGSP("enable-selectiondag-sp",
                                           cl::init(true), cl::Hidden);
 
 char StackProtector::ID = 0;
+
 INITIALIZE_PASS_BEGIN(StackProtector, DEBUG_TYPE,
                       "Insert stack protectors", false, true)
 INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)