pytorch

7deb1726 - Remove native_functions.yaml dependency from ScanKernels.cu (#66620)

Remove native_functions.yaml dependency from ScanKernels.cu (#66620) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/66620 This splits the Tensor-dependant code out into a cpp file. A slight complicating factor is `scan_dim` using `copy_` to handle non-contiguous out arguments. So, I've moved that code into the caller which does introduce some duplication. Though it's only ~10 lines extra in total. Test Plan: Imported from OSS Reviewed By: VitalyFedyunin Differential Revision: D31856106 Pulled By: dagitses fbshipit-source-id: 91bb4ce5e7c6487e3ea0d5ec4d9f7a625d8ef978