Integrate LLVM at llvm/llvm-project@47e2644c89b3
Integrate LLVM at llvm/llvm-project@47e2644c89b3

Updates LLVM usage to match
[47e2644c89b3](https://github.com/llvm/llvm-project/commit/47e2644c89b3)

PiperOrigin-RevId: 411775291

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