Integrate LLVM at llvm/llvm-project@3f97c66b0040
Integrate LLVM at llvm/llvm-project@3f97c66b0040

Updates LLVM usage to match
[3f97c66b0040](https://github.com/llvm/llvm-project/commit/3f97c66b0040)

PiperOrigin-RevId: 368763888

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