Have embedding_dense_backward match JIT signature. (#19427)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19427
ghimport-source-id: 93438cd495129a1e41118c62e6339909783035fd
Differential Revision: D15003385
Pulled By: gchanan
fbshipit-source-id: 53cbe18aa4541a2501f496abfee526e40093c0ff
