Integrate LLVM at llvm/llvm-project@7cb4c2617391
Integrate LLVM at llvm/llvm-project@7cb4c2617391

Updates LLVM usage to match
[7cb4c2617391](https://github.com/llvm/llvm-project/commit/7cb4c2617391)

PiperOrigin-RevId: 424322129

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