[llvm] [LAA] Catch load/store to invariant address in dependency checker. (PR #187023)

[Corentin Kerisit via llvm-commits]

cerisier wrote:

I cherry-picked this into our llvm-21 fork. It applies easily except for a test that was not existing prior. Tests passes and reproducer now produces correct values:
```
  O0: expect 100, got 100
  O1: expect 100, got 100
  O2: expect 100, got 100
```

@artagnon @fhahn  Would it be possible to cherry-pick this into `release/22.x` AND release/21.x` as well ?

`21.x` would allow requesting for a zig 0.16.1

cc @andrewrk 


https://github.com/llvm/llvm-project/pull/187023