[llvm] [CodeGen][NewPM] Port StackSlotColoring to NPM. (PR #125876)

[Christudasan Devadasan via llvm-commits]

cdevadas wrote:

Couldn't include a test. All existing tests are tied with passes yet to be ported (greedy,virtregrewriter,prologepilog, etc.).

https://github.com/llvm/llvm-project/pull/125876