improve deep equality check in alias annotation test (#15031)
Summary:
Previously we were returning true if either IValue wasn't a tensor, which…is bad
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15031
Differential Revision: D13409759
Pulled By: suo
fbshipit-source-id: f8bdcd05d334c1276ce46f55812065d358c1ff5d
