[llvm] [CodeGen][NewPM] Port LiveStacks analysis to NPM (PR #118778)

[Akshat Oke via llvm-commits]

optimisan wrote:

### Merge activity

* **Dec 6, 4:43 AM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/118778).


https://github.com/llvm/llvm-project/pull/118778