Move jit from cpu userbenchmark supportted arg to an extra arg (#1797)
Summary:
Fixed cpu userbenchmark on jit mode
works for https://github.com/pytorch/benchmark/issues/1293
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1797
Reviewed By: FindHao
Differential Revision: D47917179
Pulled By: xuzhao9
fbshipit-source-id: fcb95f7c9e9b5a3cf199afe1e3d6a1e19036884d