Integrate LLVM at llvm/llvm-project@21fd87595297
Integrate LLVM at llvm/llvm-project@21fd87595297

Updates LLVM usage to match
[21fd87595297](https://github.com/llvm/llvm-project/commit/21fd87595297)

PiperOrigin-RevId: 383591351

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