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48223b8f - Silently disable default saved tensor hooks during tracing (#123196)

Silently disable default saved tensor hooks during tracing (#123196) Summary: FIXES #113263. Same idea as in https://github.com/pytorch/pytorch/pull/113417, but we need a more intrusive C API to silently nop default saved tensor hooks, in order to support user-code that use torch.autograd.disable_saved_tensors_hooks (see test_unpack_hooks_can_be_disabled). We mock the output of get_hooks while leaving push/pop untouched. For compiled autograd, we're firing pack hooks once and unpack hooks twice right now, I'll look into this separately from this issue. X-link: https://github.com/pytorch/pytorch/pull/123196 Approved by: https://github.com/soulitzer Reviewed By: izaitsevfb Differential Revision: D58628125 Pulled By: xmfan fbshipit-source-id: 399cba07d50610ba52da55951f7b2200eb9c217f