[llvm] [NewPM][CodeGen] Add NPM support to llc (PR #69879)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> repeating what I said in #70922, I'd really like the llc NewPM support patch to go in first so we can test everything else as they're committed

@paperchalice do you think this would take much effort to move that to the bottom of the stack? This would be nice, although I don't think it's worth adding a substantial amount of additional effort to make it happen.

https://github.com/llvm/llvm-project/pull/69879