Integrate LLVM at llvm/llvm-project@b2a7f1c3904e
Integrate LLVM at llvm/llvm-project@b2a7f1c3904e

Updates LLVM usage to match
[b2a7f1c3904e](https://github.com/llvm/llvm-project/commit/b2a7f1c3904e)

PiperOrigin-RevId: 440130817

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