Move TensorImpl::CopyFrom to caffe2::Tensor (2/2) (#14858)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/14858
This diff doesn't change logic but just takes the existing code and moves it to caffe2::Tensor
Reviewed By: ezyang
Differential Revision: D13365817
fbshipit-source-id: bc73b27a793602cb14200dcdf357aa63233da43c
