Integrate LLVM at llvm/llvm-project@f8c6515554cc
Integrate LLVM at llvm/llvm-project@f8c6515554cc

Updates LLVM usage to match
[f8c6515554cc](https://github.com/llvm/llvm-project/commit/f8c6515554cc)

PiperOrigin-RevId: 386363341

tensorflow/runtime,tensorflow/runtime,tensorflow/runtime,tensorflow/runtime