Integrate LLVM at llvm/llvm-project@dc477a816198
Integrate LLVM at llvm/llvm-project@dc477a816198

Updates LLVM usage to match
[dc477a816198](https://github.com/llvm/llvm-project/commit/dc477a816198)

PiperOrigin-RevId: 470216429

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