Integrate LLVM at llvm/llvm-project@57b40b5f3438
Integrate LLVM at llvm/llvm-project@57b40b5f3438

Updates LLVM usage to match
[57b40b5f3438](https://github.com/llvm/llvm-project/commit/57b40b5f3438)

PiperOrigin-RevId: 402659751

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