[clang] [PGO] Add ability to mark cold functions as optsize/minsize/optnone (PR #69030)

[Ellis Hoag via cfe-commits]

================
@@ -1127,6 +1134,11 @@ 
PassBuilder::buildModuleSimplificationPipeline(OptimizationLevel Level,
   if (EnableSyntheticCounts && !PGOOpt)
     MPM.addPass(SyntheticCountsPropagation());
 
+  if (EnableMarkColdFunctions && PGOOpt &&
+      (PGOOpt->Action == PGOOptions::SampleUse ||
+       PGOOpt->Action == PGOOptions::IRUse))
----------------
ellishg wrote:

It seems that this pass isn't enabled for CS profiles. Can they benefit from 
this pass?

https://github.com/llvm/llvm-project/pull/69030
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