pytorch

fc6dd0bc - [JIT] Move UseVariadicCat internals (#63577)

[JIT] Move UseVariadicCat internals (#63577) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/63577 Since other variadic ops will have an almost identical implementation, we can generalize the `UseVariadicCat` implementation and put it in a common folder. Also moved some test utilities that other variadic op tests will likely need. Test Plan: `buck test caffe2/test/cpp/jit:jit -- ConcatOptTest` Reviewed By: navahgar Differential Revision: D30409937 fbshipit-source-id: 925c11c27b58ce98cb8368d2a205e26ba66d3db9