Integrate LLVM at llvm/llvm-project@a48300aee570
Integrate LLVM at llvm/llvm-project@a48300aee570

Updates LLVM usage to match
[a48300aee570](https://github.com/llvm/llvm-project/commit/a48300aee570)

PiperOrigin-RevId: 444256388

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