Modify StorageImplCreateHelper (#118459)
I want to use tensor.untyped_storage()[a:b] for ``PrivateUse1`` backend but fail. The code will go into ``THPStorage_get``:
https://github.com/pytorch/pytorch/blob/bb6eba189f92790f278f1ee2840f3786da02acaa/torch/csrc/Storage.cpp#L525-L540
Here ``torch`` will create a new ``c10::StorageImpl`` but not consider about ``PrivateUse1`` backend.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/118459
Approved by: https://github.com/albanD
