[pytorch] add operator name to callBoxed() error message (#39562)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39562
Improve error message to help debug missing boxed kernel error.
ghstack-source-id: 105407643
Test Plan: CI
Differential Revision: D21900540
fbshipit-source-id: 3d977bf2a7b886be9b3f940342c9bc5e186479e4
