[clang] [llvm] [InstrPGO] Instrument sampling profile based cold function (PR #109837)

[via llvm-commits]

================
@@ -53,6 +53,8 @@ class PGOInstrumentationGenCreateVar
   bool ProfileSampling;
 };
 
+enum class InstrColdFuncCovMode { Conservative = 0, Optimistic };
----------------
WenleiHe wrote:

remove this? 

https://github.com/llvm/llvm-project/pull/109837