[clang] [SampleProf][OMP] Handle OMP helper function name canonicalization (PR #178339)

[Wei Wang via cfe-commits]

apolloww wrote:

> I understand it won't _affect_ other passes, but I don't think it's a good idea to emit something that's probably not used. For example, if I don't use SamplePGO, why would I want these attributes?

This is very good point. Let me make the change.

https://github.com/llvm/llvm-project/pull/178339