Integrate LLVM at llvm/llvm-project@9474c3009e80
Integrate LLVM at llvm/llvm-project@9474c3009e80

Updates LLVM usage to match
[9474c3009e80](https://github.com/llvm/llvm-project/commit/9474c3009e80)

PiperOrigin-RevId: 428095838

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