Add functionality to TRT backend (#1753)
Summary:
- Add argument parsing for backend arguments to be passed to Torch-TRT
- Add capability to specify IR and other Torch-TRT fields via command line interface
- Add functionality to compilation path and clean up code
cc: narendasan
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1753
Reviewed By: FindHao
Differential Revision: D47682302
Pulled By: xuzhao9
fbshipit-source-id: 4f1a17db1b44908aa564099c8afcc55fb7fdb0df
