Integrate LLVM at llvm/llvm-project@de9611befeeb
Integrate LLVM at llvm/llvm-project@de9611befeeb

Updates LLVM usage to match
[de9611befeeb](https://github.com/llvm/llvm-project/commit/de9611befeeb)

PiperOrigin-RevId: 431563901

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