[llvm] [BOLT] Introduce skip-inline flag (PR #128135)

[Davide Italiano via llvm-commits]

https://github.com/dcci approved this pull request.

This is fine to me, but I wonder if we want to potentially build something more general (in the future). LLVM has a concept of `-opt-bisect-limit` that allows the `opt` pipeline to stop after N optimizations.

Maybe something like `skip=<pass_name>,{list_of_funcs}`. Just a random thought, I don't think this PR should be blocked on it.

https://github.com/llvm/llvm-project/pull/128135