Integrate LLVM at llvm/llvm-project@c5c1ec7945ff
Integrate LLVM at llvm/llvm-project@c5c1ec7945ff

Updates LLVM usage to match
[c5c1ec7945ff](https://github.com/llvm/llvm-project/commit/c5c1ec7945ff)

PiperOrigin-RevId: 376014620

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