Remove variable wrapping from register_c10_ops (#29207)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29207
The logic calling c10 ops from JIT did some variable wrapping to make sure all results are always variables.
Thanks to ezyang, this is not needed anymore because everything is a variable now.
ghstack-source-id: 93345590
Test Plan: waitforsandcastle
Differential Revision: D18327507
fbshipit-source-id: 86512c5e19d6972d70f125feae172461c25e3cb6
