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

[via cfe-commits]

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

remove this? 

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