relax type equality constraint (#60638)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60638
Initial proposal in https://github.com/pytorch/pytorch/pull/58981#issuecomment-866690334. Opposed to the proposal, this PR only allows relaxing the type equality constraint to a common superclass constraint, for example `torch.Tensor` vs `torch.nn.Parameter`. Inputs that do not share a common superclass will still fail.
Test Plan: Imported from OSS
Reviewed By: soulitzer
Differential Revision: D29626811
Pulled By: mruberry
fbshipit-source-id: 1916c3b710d38889de7ce57eb0770c76cbbb8166
