Integrate LLVM at llvm/llvm-project@422fc5603ab5
Integrate LLVM at llvm/llvm-project@422fc5603ab5

Updates LLVM usage to match
[422fc5603ab5](https://github.com/llvm/llvm-project/commit/422fc5603ab5)

PiperOrigin-RevId: 390410958

google-research/structured-additive-IR,google-research/structured-additive-IR