Assert against using Operator methods not supported when exporting it to c10 (#17818)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17818
Some of these are probably implementable for exported operators,
but aren't implemented yet and for now it's better to assert than to just return wrong results.
Reviewed By: ezyang
Differential Revision: D14392459
fbshipit-source-id: bf86e6cb0a7cfefd112a65dc85cc243e57a5ad52
