Revert D30388099: Add a common autograd TLS state
Test Plan: revert-hammer
Differential Revision:
D30388099 (https://github.com/pytorch/pytorch/commit/83d9bad44a1e1e6202103cd22e4dbd2bd3d7dae0)
Original commit changeset: 8e03f940150f
fbshipit-source-id: f6d60fec66e8292f5268335bb8a3e7e1a662f23b
