[PyTorch] Re-order TensorImpl fields to save a word (#50920)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50920
There was a hole left after previous changes.
ghstack-source-id: 120714378
Test Plan: static_assert still passes.
Reviewed By: ezyang
Differential Revision: D26008763
fbshipit-source-id: c3830328835e28a0d06c833172ac60457049824b
