Integrate LLVM at llvm/llvm-project@54cc7de4bc01
Integrate LLVM at llvm/llvm-project@54cc7de4bc01

Updates LLVM usage to match
[54cc7de4bc01](https://github.com/llvm/llvm-project/commit/54cc7de4bc01)

PiperOrigin-RevId: 439793486

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