Integrate LLVM at llvm/llvm-project@b9cfa016daae
Integrate LLVM at llvm/llvm-project@b9cfa016daae

Updates LLVM usage to match
[b9cfa016daae](https://github.com/llvm/llvm-project/commit/b9cfa016daae)

PiperOrigin-RevId: 404216120

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