Swap Caffe2 operator constructor to pass arguments by value (#16576)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16576
allows instantiation of operator with arguments passed by move rather than explicit copies
per Sebastian's suggestion
Reviewed By: smessmer
Differential Revision: D13882416
fbshipit-source-id: bc8d50e73f5a1ae87155b0cf96799b8573a7a8fa
