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

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

repeating what I said in https://github.com/llvm/llvm-project/pull/70922, I'd really like the llc NewPM support patch to go in first so we can test everything else as they're committed

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