InstrProf: Use LLVM's -instrprof pass for profiling

The logic for lowering profiling counters has been moved to an LLVM
pass. Emit the intrinsics rather than duplicating the whole pass in
clang.

llvm-svn: 223683

clang/lib/CodeGen/CodeGenModule.cpp

@@ -345,9 +345,6 @@ void CodeGenModule::Release() {
   if (ObjCRuntime)
     if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
       AddGlobalCtor(ObjCInitFunction);
-  if (getCodeGenOpts().ProfileInstrGenerate)
-    if (llvm::Function *PGOInit = CodeGenPGO::emitInitialization(*this))
-      AddGlobalCtor(PGOInit, 0);
   if (PGOReader && PGOStats.hasDiagnostics())
     PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
   EmitCtorList(GlobalCtors, "llvm.global_ctors");