Lower ReLu6 to aten (#52723)
Summary:
-Lower Relu6 to ATen
-Change Python and C++ to reflect change
-adds an entry in native_functions.yaml for that new function
-this is needed as we would like to intercept ReLU6 at a higher level with an XLA-approach codegen.
-Should pass functional C++ tests pass. But please let me know if more tests are required.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52723
Reviewed By: ailzhang
Differential Revision: D26641414
Pulled By: albanD
fbshipit-source-id: dacfc70a236c4313f95901524f5f021503f6a60f