Add several ops for portal NLU/ASR model (again) (#37801)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37801
D21215050 was reverted. Re do it.
Test Plan: build, CI
Reviewed By: iseeyuan
Differential Revision: D21393474
fbshipit-source-id: 2e86d5d1980a122a847e146dc6357627ec31d80d
