Synchronize submodules with LLVM at llvm/llvm-project@1524b0154116

Updates LLVM dependencies to match
[1524b0154116](https://github.com/llvm/llvm-project/commit/1524b0154116).
- TensorFlow to
[6cfb888ddd2f](https://github.com/tensorflow/tensorflow/commit/6cfb888ddd2f)
- MLIR-HLO to
[77c60b21da7b](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: 395571706