Implement c10::Tensor (#14819)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/14819
This is a minimal wrapper for a c10::TensorImpl,
maybe destined for greatness later when we move caffe2::Tensor or at::Tensor into c10.
Reviewed By: dzhulgakov
Differential Revision: D13348039
fbshipit-source-id: 874f515358e94f35dc7a4c3e55b35fde59c51ff1
