[llvm] [AMDGPU][NewPM] Format llc-pipeline-npm.ll better (PR #174161)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> Thanks. I was leaning toward fixing the pass pipeline printer to dump each pass's details on a separate line, much like the legacy PM's output. That would avoid similar local hacks. We also missed the short description of the pass here, but we can live without that. For the time being, this looks good.

Yeah, I was thinking a `-pretty-print-passes` or something would be a good idea. I think the main thing that would be nice would be indentation for adapters.

https://github.com/llvm/llvm-project/pull/174161