Integrate LLVM at llvm/llvm-project@e2e1a78abcef
Integrate LLVM at llvm/llvm-project@e2e1a78abcef

Updates LLVM usage to match
[e2e1a78abcef](https://github.com/llvm/llvm-project/commit/e2e1a78abcef)

PiperOrigin-RevId: 374360199

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