add fbgemm fp16 (fbfcpacked) support, add global_init_net in predictor_export_meta (#17905)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17905
support adding op in global_init_net. because pred_init_net is per thread, and just doesn't cut it.
Reviewed By: jspark1105
Differential Revision: D14114134
fbshipit-source-id: 112bb2ceb9d3d5e663dd430585567f4eaa2db35f
