[llvm-branch-commits] [X86][NewPM] Port X86LowerAMXType to NewPM (PR #165084)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/165084

To enable the eventual migration of everything to the NewPM. There are
two tests using this pass that rely on it running on functions marked
optnone. Leave these as TODOs for now, probably coming back to them in
the future when we have a way to override the optnone pass
instrumentation through a CLI flag or something.