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8448045c - handle tensor subclass with non-classmethod `__torch_function__` (#151061)

handle tensor subclass with non-classmethod `__torch_function__` (#151061) Summary: As title, this patch fixes bugs in 1. emulating `has_torch_function` 2. emulating calling `__torch_function__` 3. building a callable VT for non-classmethod `__torch_function__` Fixes #120799, #150265, #150848. X-link: https://github.com/pytorch/pytorch/pull/151061 Approved by: https://github.com/anijain2305, https://github.com/mlazos ghstack dependencies: #151060 Reviewed By: Camyll Differential Revision: D73043020 fbshipit-source-id: 32185e61f1a8d666bc6672fd0b838d86315a9d1d