Support communicating with C2 protobuf in Onnxifi flow (#15472)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15472
Create a path to pass serialized C2 protobuf instead of ONNX during ONNXIFI flow
Reviewed By: houseroad
Differential Revision: D13536603
fbshipit-source-id: 7d016474f4beedbda480ed2e2c0004af7868aafe
