Integrate LLVM at llvm/llvm-project@e0b469ffa142
Integrate LLVM at llvm/llvm-project@e0b469ffa142

Updates LLVM usage to match
[e0b469ffa142](https://github.com/llvm/llvm-project/commit/e0b469ffa142)

PiperOrigin-RevId: 378992873

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