Integrate LLVM at llvm/llvm-project@ad0f6e1d9840
Integrate LLVM at llvm/llvm-project@ad0f6e1d9840

Updates LLVM usage to match
[ad0f6e1d9840](https://github.com/llvm/llvm-project/commit/ad0f6e1d9840)

PiperOrigin-RevId: 391890812

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