Integrate LLVM at llvm/llvm-project@7dbfcfa735f2
Integrate LLVM at llvm/llvm-project@7dbfcfa735f2

Updates LLVM usage to match
[7dbfcfa735f2](https://github.com/llvm/llvm-project/commit/7dbfcfa735f2)

PiperOrigin-RevId: 454111241

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