Add options to jit's operator constructor (#21315)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21315
ghimport-source-id: 168ddecb333a8cb309e7b859683de9b077123205
Differential Revision: D15614506
Pulled By: bwasti
fbshipit-source-id: ae013a88e2069c38845b5b8ff805db96ab2c29e9
