Fix Tensor clear to properly clear slots #143203
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/143203
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ghstack-source-id: 54286b8 Pull Request resolved: pytorch/pytorch#143203
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Fixes a bug introduced in #137267
While the test ensures the finalizer did run to make sure things are cleared, the objects are not properly collected by the gc due to the faulty tp_clear implementation. So, while the finalizer did run, the object was still alive.
Fixing this by giving tp_clear the same treatment as tp_traverse and tp_dealloc on Tensor: make it a unique function that handles the full subclass hierarchy in one place.
Stack from ghstack (oldest at bottom):