Support for instrumenting only selected files or functions

This change implements support for applying profile instrumentation
only to selected files or functions. The implementation uses the
sanitizer special case list format to select which files and functions
to instrument, and relies on the new noprofile IR attribute to exclude
functions from instrumentation.

Differential Revision: https://reviews.llvm.org/D94820

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -839,6 +839,10 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
     }
   }
 
+  if (CGM.getCodeGenOpts().getProfileInstr() != CodeGenOptions::ProfileNone)
+    if (CGM.isProfileInstrExcluded(Fn, Loc))
+      Fn->addFnAttr(llvm::Attribute::NoProfile);
+
   unsigned Count, Offset;
   if (const auto *Attr =
           D ? D->getAttr<PatchableFunctionEntryAttr>() : nullptr) {