add a unit test for lack of devices (#48858)
Summary:
add a unit test for the situation where devices have no enough memory
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48858
Reviewed By: malfet, gcatron
Differential Revision: D25341254
Pulled By: scottxu0730
fbshipit-source-id: c0524c22717b6c8afd67f5b0ad0f1851b973e4b7
