make_variable consumes the Tensor if it only has one reference
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/22705
Test Plan: Imported from OSS
Differential Revision: D16192220
Pulled By: jamesr66a
fbshipit-source-id: 9c42bb759077b74a1370d3a2d7114ed3593f333b
