Integrate LLVM at llvm/llvm-project@a8f69be61fc8
Integrate LLVM at llvm/llvm-project@a8f69be61fc8

Updates LLVM usage to match
[a8f69be61fc8](https://github.com/llvm/llvm-project/commit/a8f69be61fc8)

PiperOrigin-RevId: 403075307

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