Adding missing self.loader (#1148)
Summary:
`get_module` later reads `self.loader`
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1148
Reviewed By: malfet
Differential Revision: D39212518
Pulled By: xuzhao9
fbshipit-source-id: d389354db3f7eab5a18e3a529a704dc72f7a8f58
