Integrate LLVM at llvm/llvm-project@69a909b9fefe
Integrate LLVM at llvm/llvm-project@69a909b9fefe

Updates LLVM usage to match
[69a909b9fefe](https://github.com/llvm/llvm-project/commit/69a909b9fefe)

PiperOrigin-RevId: 389712284

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