[PyTorch] TensorImpl::is_non_overlapping_and_dense_ should default to true (#48625)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48625
The default TensorImpl is contiguous. Therefore, it is non-overlapping and dense per refresh_contiguous().
ghstack-source-id: 118035410
Test Plan: CI
Reviewed By: ezyang
Differential Revision: D25232196
fbshipit-source-id: 1968d9ed444f2ad5414a78d0b11e5d3030e3109d
