Add some extra info to PyTorchStreamReader/Writer errors (#27006)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27006
Prompted by the lack of filename info in the error message for
torch.jit.save() to an unwriteable location... looks like most
serialization code paths have upstream checks that include more
info, but adding the extra info here as well seemed simple and
cheap enough, so went ahead and did it more generally.
Test Plan: Imported from OSS
Differential Revision: D17642686
Pulled By: bhosmer
fbshipit-source-id: 435ae4c8b86bd730157b3dde19882e031c6415cd
