Integrate LLVM at llvm/llvm-project@4cbfd2e7ebb5
Integrate LLVM at llvm/llvm-project@4cbfd2e7ebb5

Updates LLVM usage to match
[4cbfd2e7ebb5](https://github.com/llvm/llvm-project/commit/4cbfd2e7ebb5)

PiperOrigin-RevId: 452266163

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