introduce a new intrace to add op [C2 changes] (#21148)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21148
The diff modifies the interface for Caffe2 operators in the benchmark suite
Reviewed By: zheng-xq
Differential Revision: D15433888
fbshipit-source-id: c264a95906422d7a26c10b1f9836ba8b35e36b53
