Integrate LLVM at llvm/llvm-project@4821508d4db7
Integrate LLVM at llvm/llvm-project@4821508d4db7

Updates LLVM usage to match
[4821508d4db7](https://github.com/llvm/llvm-project/commit/4821508d4db7)

PiperOrigin-RevId: 457244342

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