Add TORCH_CHECK_NOT_IMPLEMENTED/c10::NotImplementedError; make dispatch use it (#53377)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53377
My underlying goal is I want to make the test suite ignore
NotImplementedError without failing when bringing up a backend (meta)
that doesn't have very many functions implemented.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: mrshenli
Differential Revision: D26850766
Pulled By: ezyang
fbshipit-source-id: ffbdecd22b06b5ac23e1997723a6e2a71dfcd14a
