[llvm] [NewPM] Port x86-pad-short-functions to new PM (PR #190886)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

There are still a lot of formatting changes and code movement that are making this more difficult to review than it should be. The diff for this should be relatively clean.

https://github.com/llvm/llvm-project/pull/190886