Set caffe2_tvm_min_ops to 8 (#23893)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23893
Set `caffe2_tvm_min_ops` to 8 for production and tests.
Reviewed By: yinghai
Differential Revision: D16659420
fbshipit-source-id: ef33b37e2a5128e502a6b8df306914a409f13c2d
