[clang] [flang] Add IR Profile-Guided Optimization (IR PGO) support to the Flang compiler (PR #136098)

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fanju110 wrote:

> If I understand what you are saying correctly, this would involve, for example, duplicating the definition of `enum ProfileInstrKind` in `flang` in this PR, then a second PR that moves it from both `flang` and `clang` to `llvm/Frontend`. This is churn that can be distracting. The changes to `clang` in this case are unlikely to be major and getting it reviewed and approved should not be difficult. I would suggest doing those in this PR.

Thanks for the advice, I agree with you, I'm currently refining the codes

https://github.com/llvm/llvm-project/pull/136098