Fixes cuda->numpy and non-strided->numpy segfaults (#33612)
Summary:
Addresses https://github.com/pytorch/pytorch/issues/33300.
Calling .numpy() on a CUDA or non-strided (e.g. sparse) tensor segfaults in current PyTorch. This fixes the segfaults and throws the appropriate TypeError, as was intended.
Two tests, one in test_cuda.py and the other in test_sparse.py, are added to verify the behavior.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33612
Differential Revision: D20038210
Pulled By: mruberry
fbshipit-source-id: 265531dacd37c392232fd3ec763489a62ef54795
