Synchronize submodules with LLVM at llvm/llvm-project@c56bbb3961e4
Synchronize submodules with LLVM at llvm/llvm-project@c56bbb3961e4

Updates LLVM dependencies to match
[c56bbb3961e4](https://github.com/llvm/llvm-project/commit/c56bbb3961e4).
- llvm-bazel to
  [8ac1a9f32bc8](https://github.com/google/llvm-bazel/commit/8ac1a9f32bc8)
- TensorFlow to
  [b86f3c8875a8](https://github.com/tensorflow/tensorflow/commit/b86f3c8875a8)

`./scripts/git/update_to_llvm_syncpoint.py `

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/3641 from GMNGeoffrey:llvm-dependent-submodule-update 0c4c8a3339857d14fd541539dc600abc4c5cb52f
PiperOrigin-RevId: 339493753

google/iree,google/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree