Integrate LLVM at llvm/llvm-project@3ca6eee2a975
Integrate LLVM at llvm/llvm-project@3ca6eee2a975

Updates LLVM usage to match
[3ca6eee2a975](https://github.com/llvm/llvm-project/commit/3ca6eee2a975)

PiperOrigin-RevId: 396514367

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