[llvm] [llvm-profgen] Filter out ambiguous cold profiles during profile generation (PR #81803)

[via llvm-commits]

https://github.com/WenleiHe commented:

> the profile is generated either from one version or the merged version, which is ambiguous. 

Please make the change description clearer. A few things to clarify in the change description: 1) what are the profiles we can't differentiate, 2) why we have these different functions and profiles. 3) why we can't attribute profiles accurately. 


https://github.com/llvm/llvm-project/pull/81803