Integrate LLVM at llvm/llvm-project@6069a6a50494
Integrate LLVM at llvm/llvm-project@6069a6a50494

Updates LLVM usage to match
[6069a6a50494](https://github.com/llvm/llvm-project/commit/6069a6a50494)

PiperOrigin-RevId: 403443891

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