pytorch

6ba6ecb0 - Only use hacky_wrapper_for_legacy_signatures if an op needs it (#45742)

Only use hacky_wrapper_for_legacy_signatures if an op needs it (#45742) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/45742 Add a new flag to native_functions.yaml: `use_c10_dispatcher: hacky_wrapper_for_legacy_signatures` and the codegen only wraps kernels in the aforementioned wrapper if that flag is set. Apart from that, `use_c10_dispatcher: hacky_wrapper_for_legacy_signatures` is equivalent to `full`, i.e. it has full boxing and unboxing support. This greatly reduces the number of ops we apply the hacky_wrapper to, i.e. all ops marked as `use_c10_dispatcher: full` don't have it anymore. ghstack-source-id: 113982139 Test Plan: waitforsandcastle vs fbcode: https://www.internalfb.com/intern/fblearner/details/214511705/ vs base diff: https://www.internalfb.com/intern/fblearner/details/214693207/ Reviewed By: ezyang Differential Revision: D23328718 fbshipit-source-id: be120579477b3a05f26ca5f75025bfac37617620