Integrate LLVM at llvm/llvm-project@8cb234e07d46
Integrate LLVM at llvm/llvm-project@8cb234e07d46

Updates LLVM usage to match
[8cb234e07d46](https://github.com/llvm/llvm-project/commit/8cb234e07d46)

PiperOrigin-RevId: 399154862

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