Add test for #17271 (torch.exp incorrect for 2**31 size tensor) (#18292)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18292
ghimport-source-id: a3e96584db0eef7b6202a1211808f9f6e59dd529
Stack from [ghstack](https://github.com/ezyang/ghstack):
* **#18292 Add test for #17271 (torch.exp incorrect for 2**31 size tensor)**
* #18291 Correctly call superclass setUp in TestCase subclasses.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Differential Revision: D14567642
fbshipit-source-id: c60ee7597a86f5d2c5c0b72cb106f17815950427
