[IR] Add `MD_prof` to the `Keep` list of `dropUBImplyingAttrsAndMetadata`#154635

mtrofin merged 2 commits intomainllvm/llvm-project:mainfrom

users/mtrofin/08-20-_local_preserve_md_prof_in_hoistallinstructionsinto_llvm/llvm-project:users/mtrofin/08-20-_local_preserve_md_prof_in_hoistallinstructionsinto_Copy head branch name to clipboard