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

[Lei Wang via llvm-commits]

wlei-llvm wrote:

> > 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.

Updated the description.

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