Integrate LLVM at llvm/llvm-project@d56b171ee965
Integrate LLVM at llvm/llvm-project@d56b171ee965

Updates LLVM usage to match
[d56b171ee965](https://github.com/llvm/llvm-project/commit/d56b171ee965)

PiperOrigin-RevId: 409233989

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