Integrate LLVM at llvm/llvm-project@1819d5999c70
Integrate LLVM at llvm/llvm-project@1819d5999c70

Updates LLVM usage to match
[1819d5999c70](https://github.com/llvm/llvm-project/commit/1819d5999c70)

PiperOrigin-RevId: 473707560

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