Integrate LLVM at llvm/llvm-project@f7b1fa6f5ebe
Integrate LLVM at llvm/llvm-project@f7b1fa6f5ebe

Updates LLVM usage to match
[f7b1fa6f5ebe](https://github.com/llvm/llvm-project/commit/f7b1fa6f5ebe)

PiperOrigin-RevId: 381459627

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