Integrate LLVM at llvm/llvm-project@628dda08b82f
Integrate LLVM at llvm/llvm-project@628dda08b82f

Updates LLVM usage to match
[628dda08b82f](https://github.com/llvm/llvm-project/commit/628dda08b82f)

PiperOrigin-RevId: 367238750

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