Integrate LLVM at llvm/llvm-project@4a661602ef2d
Integrate LLVM at llvm/llvm-project@4a661602ef2d

Updates LLVM usage to match
[4a661602ef2d](https://github.com/llvm/llvm-project/commit/4a661602ef2d)

PiperOrigin-RevId: 420357156

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