Integrate LLVM at llvm/llvm-project@7d659c6ac741
Integrate LLVM at llvm/llvm-project@7d659c6ac741

Updates LLVM usage to match
[7d659c6ac741](https://github.com/llvm/llvm-project/commit/7d659c6ac741)

PiperOrigin-RevId: 419022828

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