Integrate LLVM at llvm/llvm-project@e996f1d4194b
Integrate LLVM at llvm/llvm-project@e996f1d4194b

Updates LLVM usage to match
[e996f1d4194b](https://github.com/llvm/llvm-project/commit/e996f1d4194b)

PiperOrigin-RevId: 352943239

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