Get TestTorch.test_empty_meta working again (#48113)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48113
Fix is simple: just treat Meta as a backend covered by AutogradOther.
This semantically makes sense, since meta kernels are just like regular
CPU/CUDA kernels, they just don't do any compute.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: zhangguanheng66
Differential Revision: D25056641
Pulled By: ezyang
fbshipit-source-id: 7b68911982352b3e0ee8616b38cd9c70bd58a740
