[llvm] [BOLT] Add support for safe-icf (PR #116275)

[Davide Italiano via llvm-commits]

https://github.com/dcci commented:

Thanks for making this better. The final version is very clean and this is good for me to land. Please wait for @maksfb if he has other comments.

https://github.com/llvm/llvm-project/pull/116275