Integrate LLVM at llvm/llvm-project@d1aaef429659
Integrate LLVM at llvm/llvm-project@d1aaef429659

Updates LLVM usage to match
[d1aaef429659](https://github.com/llvm/llvm-project/commit/d1aaef429659)

PiperOrigin-RevId: 401897896

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