Synchronize submodules with LLVM at llvm/llvm-project@3383ec5fdd04

Updates LLVM dependencies to match
[3383ec5fdd04](https://github.com/llvm/llvm-project/commit/3383ec5fdd04).
- TensorFlow to
[ac4acf61a68b](https://github.com/tensorflow/tensorflow/commit/ac4acf61a68b)
- MLIR-HLO to
[21edc2e26a73](https://github.com/tensorflow/mlir-hlo/commit/${MLIR_HLO_SHA?})

`./scripts/git/update_to_llvm_syncpoint.py`

Automated submodule bump from .github/workflows/update_llvm_dependent_submodules.yml

PiperOrigin-RevId: 393820921