Integrate LLVM at llvm/llvm-project@09669e6c5fa1
Integrate LLVM at llvm/llvm-project@09669e6c5fa1

Updates LLVM usage to match
[09669e6c5fa1](https://github.com/llvm/llvm-project/commit/09669e6c5fa1)

PiperOrigin-RevId: 418030097

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