[llvm] Reland "[NewPM][CodeGen] Port selection dag isel to new pass manager" (PR #94149)

[Arthur Eubanks via llvm-commits]

https://github.com/aeubanks approved this pull request.

assuming you tested expensive checks locally

fwiw I would have split out the renaming and the porting into separate PRs

https://github.com/llvm/llvm-project/pull/94149