Integrate LLVM at llvm/llvm-project@56fcd4ea8daf
Integrate LLVM at llvm/llvm-project@56fcd4ea8daf

Updates LLVM usage to match
[56fcd4ea8daf](https://github.com/llvm/llvm-project/commit/56fcd4ea8daf)

PiperOrigin-RevId: 355529409

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