[llvm] [BOLT] Add --pad-funcs-before=func:n (PR #117924)

[Maksim Panchenko via llvm-commits]

https://github.com/maksfb commented:

I left the comments on the code as it is. I'll post a comment on the RFC since I'd like to understand the possible application of this feature.

https://github.com/llvm/llvm-project/pull/117924