[llvm] [CodeGen] Port mir-debugify to new pass manager (PR #193201)

[via llvm-commits]

juanvazquez wrote:

Thanks @arsenm and @paperchalice for the review and approvals.

A gentle reminder that I can not merge. I'll need somebody's help to merge once you think it's good. No rush though.

https://github.com/llvm/llvm-project/pull/193201