[llvm] [InstCombine] Set !prof metadata on selects (PR #157599)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

Changing to Draft, @alanzhao1 is doing better things here with #158375 . 

We can land this PR as a clean-all for cases that can't yet be handled correctly.

https://github.com/llvm/llvm-project/pull/157599