Revert D33460427: [pytorch][PR] [rnn/gru] : no batch dim
Test Plan: revert-hammer
Differential Revision:
D33460427 (https://github.com/pytorch/pytorch/commit/6eba936082a641be8ece156f70c0f5c435f7a7aa)
Original commit changeset: c64d9624c305
Original Phabricator Diff: D33460427 (https://github.com/pytorch/pytorch/commit/6eba936082a641be8ece156f70c0f5c435f7a7aa)
fbshipit-source-id: 9a5000e202c5f383b03dd6caad9399e46e4ce80e
