check sparse sizes (#47148)
Summary:
checks sizes of sparse tensors when comparing them in assertEqual.
Removes additional checks in safeCoalesce, safeCoalesce should not be a test for `.coalesce()` function.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47148
Reviewed By: mruberry
Differential Revision: D24823127
Pulled By: ngimel
fbshipit-source-id: 9303a6ff74aa3c9d9207803d05c0be2325fe392a
