Integrate LLVM at llvm/llvm-project@85e7578c6db8
Integrate LLVM at llvm/llvm-project@85e7578c6db8

Updates LLVM usage to match
[85e7578c6db8](https://github.com/llvm/llvm-project/commit/85e7578c6db8)

PiperOrigin-RevId: 353245217

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