Require passing version_counter and allow_tensor_metadata_change to shallow_copy_and_detach() (#20496)
Summary:
Previously, the caller of `shallow_copy_and_detach()` is responsible for deciding whether the shallow-copy should share the source TensorImpl's version counter, or have its own new version counter. However, since this decision is crucial for ensuring the correctness of the shallow-copy's version counter, we want to enforce users of `shallow_copy_and_detach()` to pass a version counter to the function call, so that they are required to make the decision at the time of API usage, not as an afterthought.
For similar reasons, we want to enforce users of `shallow_copy_and_detach()` to pass `allow_tensor_metadata_change` to the function call, so that they are required to decide "whether the TensorImpl shallow-copy should allow tensor metadata change" at the time of API usage, not as an afterthought.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20496
Differential Revision: D15363620
Pulled By: yf225
fbshipit-source-id: a65e74738b10452668d6dc644b43aad5b3d8c9e6
