Integrate LLVM at llvm/llvm-project@b52171629f56
Integrate LLVM at llvm/llvm-project@b52171629f56

Updates LLVM usage to match
[b52171629f56](https://github.com/llvm/llvm-project/commit/b52171629f56)

PiperOrigin-RevId: 392628868

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