Integrate LLVM at llvm/llvm-project@70daa353e2ae
Integrate LLVM at llvm/llvm-project@70daa353e2ae

Updates LLVM usage to match
[70daa353e2ae](https://github.com/llvm/llvm-project/commit/70daa353e2ae)

PiperOrigin-RevId: 331366764

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