Integrate LLVM at llvm/llvm-project@9b25d868f43e
Integrate LLVM at llvm/llvm-project@9b25d868f43e

Updates LLVM usage to match
[9b25d868f43e](https://github.com/llvm/llvm-project/commit/9b25d868f43e)

PiperOrigin-RevId: 427617119

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