Have embedding_dense_backward match JIT signature. (#19521)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19521
ghimport-source-id: 817d3defb5f4ee98bae1f0488f99cb0e9a5226a2
Differential Revision: D15021376
Pulled By: gchanan
fbshipit-source-id: 2e29f1d3913f94fab3347dc48676303510d7da46
