Integrate LLVM at llvm/llvm-project@2ce586bc497f
Integrate LLVM at llvm/llvm-project@2ce586bc497f

Updates LLVM usage to match
[2ce586bc497f](https://github.com/llvm/llvm-project/commit/2ce586bc497f)

PiperOrigin-RevId: 418800334

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