jit.script() testing and fixes (#23891)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23891
This adds an initial set of testing coverage for quantization that checks if the modules can be scripted. Testing for tracing and serialization is forthcoming
Test Plan: Imported from OSS
Differential Revision: D16698045
Pulled By: jamesr66a
fbshipit-source-id: 96d80d938b816220af72359165a7b96d998a30c9
