[llvm] [AMDGPU][NPM] Add isRequired to passes missing it (PR #134033)

[Akshat Oke via llvm-commits]

optimisan wrote:

> doesn't something like https://github.com/aeubanks/llvm-project/commit/2ac577e500a3b8cc77c18ac529cba57efcaf3ab7 work? if that works, do you want to send an RFC to do push this through?

I was thinking we remove `PassInfoMixin` altogether and only keep `Optional` and `AlwaysRun` mixins.

https://github.com/llvm/llvm-project/pull/134033