Integrate LLVM at llvm/llvm-project@19734ae6f054
Integrate LLVM at llvm/llvm-project@19734ae6f054

Updates LLVM usage to match
[19734ae6f054](https://github.com/llvm/llvm-project/commit/19734ae6f054)

PiperOrigin-RevId: 398640511

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