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ea31e729 - Add `is_` support for `Tensor`s, force `get_fake_value` to reuse previously computed `example_value` if available (#111565)

Add `is_` support for `Tensor`s, force `get_fake_value` to reuse previously computed `example_value` if available (#111565) Summary: Use FakeTensor id match as equivalent to object identity match cc X-link: https://github.com/pytorch/pytorch/pull/111565 Approved by: https://github.com/ezyang Reviewed By: izaitsevfb Differential Revision: D50543481 fbshipit-source-id: 1ad6dbe37b481a070ed19c450db260b8ce033f14