Revert D28412496: Revert "Revert D28387767: Add forward AD test for op info"
Test Plan: revert-hammer
Differential Revision:
D28412496 (https://github.com/pytorch/pytorch/commit/4f28c0b5909d5122b0beffa49a579fc0d5fe0f80)
Original commit changeset: 5b8e30b5e807
fbshipit-source-id: 5a47aad4d5428e97e2d2b4acb4192909360870cd
