Rename copy_tensor_data to copy_tensor_metadata (#22266)
Summary:
The original name `copy_tensor_data` could be confusing because users are not sure whether it deep-copies data in the tensor's storage or just copies the tensor's metadata. The renaming makes it more clear.
cc. ailzhang This might break XLA build, but I think the renaming makes it more clear why we use `copy_tensor_data` in XLATensorImpl's shallow-copy functions.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22266
Differential Revision: D16014724
Pulled By: yf225
fbshipit-source-id: f6ee966927d4d65d828b68264b3253b2f8fd768d
