Integrate TF at tensorflow/tensorflow@963e2693da90
Integrate TF at tensorflow/tensorflow@963e2693da90

Updates TF to
[963e2693da90](https://github.com/tensorflow/tensorflow/commit/963e2693da90)
and copies over the LLVM BUILD files.

`./scripts/git/update_tf_llvm_submodules.py --llvm_commit=KEEP --update_build_files=true`

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

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/3055 from google:auto_submodule_update 3cc7385089a886c5cf105e69db3993e9e4bbfaa2
PiperOrigin-RevId: 329739308

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