Integrate LLVM at llvm/llvm-project@346de23ec9db
Integrate LLVM at llvm/llvm-project@346de23ec9db

Updates LLVM usage to match
[346de23ec9db](https://github.com/llvm/llvm-project/commit/346de23ec9db)

PiperOrigin-RevId: 477709468

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