[llvm] [BOLT] Split unmarked tail code after CFI-bounded functions into separate functions (PR #176173)

[Paschalis Mpeis via llvm-commits]

https://github.com/paschalis-mpeis approved this pull request.

Hey Elvina,

Thanks for your work! Looks good to me.

Please give it a couple of days in case @yavtuk or @maksfb have any comments.
I also left one optional nit.

https://github.com/llvm/llvm-project/pull/176173