Revert D25441716: [te] Add BitCast to the IR
Test Plan: revert-hammer
Differential Revision:
D25441716 (https://github.com/pytorch/pytorch/commit/3384145418205b8554b3e0a7c4bbb5c15f5e2333)
Original commit changeset: c97b871697bc
fbshipit-source-id: e6eff02e28e1ae8c826dd2cfed79f869839ed2ba
