New torch assertion macros (#20887)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20887
Switch AT_xxx assertion macros to the TORCH_ variants and make sure the separation between TORCH_CHECK and TORCH_INTERNAL_ASSERT makes sense.
Differential Revision: D15484658
fbshipit-source-id: 490ae64cc36946756c30971f1b685048bc5f77da
