[dt] [caffe2] add/fix shape inference for StumpFunc, SliceGradient and ResizeLike (#35430)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35430
This fixes and adds tests for several commonly used operators.
There's some formatting differences due to running clang-format on one of the files.
Test Plan: buck test //caffe2/caffe2/fb/operators:hypothesis_test //caffe2/caffe2/python/operator_test:utility_ops_test //caffe2/caffe2/python/operator_test:concat_split_op_test
Reviewed By: yyetim
Differential Revision: D20657405
fbshipit-source-id: 51d86d0834003b8ac8d6acb5149ae13d7bbfc6ab
