Integrate LLVM at llvm/llvm-project@2e1a737f4646
Integrate LLVM at llvm/llvm-project@2e1a737f4646

Updates LLVM usage to match
[2e1a737f4646](https://github.com/llvm/llvm-project/commit/2e1a737f4646)

PiperOrigin-RevId: 339375372

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