[ProfileData] Make a utility method public, NFC

The swift frontend needs to be able to look up PGO function name
variables based on the original raw function name. That's because it's
not possible to create PGO function name variables while emitting swift
IR. Instead, we have to create the name variables while lowering swift
IR to llvm IR, at which point we fix up all calls to the increment
intrinsic to point to the right name variable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263662 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ProfileData/InstrProf.h

@@ -165,6 +165,12 @@ std::string getPGOFuncName(StringRef RawFuncName,
                            StringRef FileName,
                            uint64_t Version = INSTR_PROF_INDEX_VERSION);
 
+/// Return the name of the global variable used to store a function
+/// name in PGO instrumentation. \c FuncName is the name of the function
+/// returned by the \c getPGOFuncName call.
+std::string getPGOFuncNameVarName(StringRef FuncName,
+                                  GlobalValue::LinkageTypes Linkage);
+
 /// Create and return the global variable for function name used in PGO
 /// instrumentation. \c FuncName is the name of the function returned
 /// by \c getPGOFuncName call.

lib/ProfileData/InstrProf.cpp

@@ -99,8 +99,8 @@ StringRef getFuncNameWithoutPrefix(StringRef PGOFuncName, StringRef FileName) {
 
 // \p FuncName is the string used as profile lookup key for the function. A
 // symbol is created to hold the name. Return the legalized symbol name.
-static std::string getPGOFuncNameVarName(StringRef FuncName,
-                                         GlobalValue::LinkageTypes Linkage) {
+std::string getPGOFuncNameVarName(StringRef FuncName,
+                                  GlobalValue::LinkageTypes Linkage) {
   std::string VarName = getInstrProfNameVarPrefix();
   VarName += FuncName;