Integrate LLVM at llvm/llvm-project@c8d73d939fa4
Integrate LLVM at llvm/llvm-project@c8d73d939fa4

Updates LLVM usage to match
[c8d73d939fa4](https://github.com/llvm/llvm-project/commit/c8d73d939fa4)

PiperOrigin-RevId: 342068766

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