Integrate LLVM at llvm/llvm-project@60605a2b8fa2
Integrate LLVM at llvm/llvm-project@60605a2b8fa2

Updates LLVM usage to match
[60605a2b8fa2](https://github.com/llvm/llvm-project/commit/60605a2b8fa2)

PiperOrigin-RevId: 403025493

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