pytorch

3fc9bc43 - dbr quant overhead[4/x]: speed up hook type calculations (#68351)

dbr quant overhead[4/x]: speed up hook type calculations (#68351) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/68351 Speeds up `get_module_hook_type` and `get_torch_function_hook_type` by bypassing the expensive `torch.nn.Module` getters and setters and fetching `_auto_quant_state` directly. Test Plan: Model level benchmarking is noisy. Individual `cProfile` results: ``` // MobileNetV2, 1x3x224x224 input, % of time spent by function during DBR convert // before get_module_hook_type - 5.96% get_torch_function_hook_type - 2.24% // after get_module_hook_type - 2.10% get_torch_function_hook_type - 0.57% ``` Reviewed By: jerryzh168 Differential Revision: D32463756 Pulled By: vkuzo fbshipit-source-id: 6eb199052ddf8d78f1c123a427e7437fc7c4fe58