================
@@ -1182,8 +1187,13 @@ 
PassBuilder::buildModuleSimplificationPipeline(OptimizationLevel Level,
   const bool IsCtxProfUse =
       !UseCtxProfile.empty() && Phase == ThinOrFullLTOPhase::ThinLTOPreLink;
 
+  // Enable cold function coverage instrumentation if
+  // InstrumentColdFuncOnlyPath is provided.
+  const bool IsColdFuncOnlyInstrGen = PGOInstrumentColdFunctionOnly =
----------------
wlei-llvm wrote:

Thanks for pointing out. It's intentional to set the global variable, I wasn't 
aware it will cause data race. I will try to change it to local one. 

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