Limit max numel for test tensors (#38304)
Summary:
Add `max_numel` option to `hypothesys_utils.array_shapes`
Use it to limit tensor element count to 100K for tensors whose maximum number of elements can exceed 250K
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38304
Differential Revision: D21525483
Pulled By: malfet
fbshipit-source-id: fac132dc7274b9417141b708cc9535561a95fcb3
