Integrate LLVM at llvm/llvm-project@96ef4f307df2
Integrate LLVM at llvm/llvm-project@96ef4f307df2

Updates LLVM usage to match
[96ef4f307df2](https://github.com/llvm/llvm-project/commit/96ef4f307df2)

PiperOrigin-RevId: 352786460

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