Integrate LLVM at llvm/llvm-project@662f9bff337b
Integrate LLVM at llvm/llvm-project@662f9bff337b

Updates LLVM usage to match
[662f9bff337b](https://github.com/llvm/llvm-project/commit/662f9bff337b)

PiperOrigin-RevId: 379699574

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