Parse opt_args even when dynamo is used
Previously we had two versions of opt_args - one generated by dynamo and
one generated by the non-dynamo path. If we add this change, then we'll
be able to add arguments into opt_args that we would like to use in both
dynamo and non-dynamo contexts
ghstack-source-id: a5bc7e49230bb7b5d6aa1e833bfefa86dd0a949e
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1278
