Add support for generic list constants (#36953)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36953
Add support for generic lists as a constant. generic dicts & tuples are already implemented. This is a pretty common pattern and cuts down on the number of non-tensor nodes executed in interpolate tests.
Test Plan: Imported from OSS
Differential Revision: D21160761
Pulled By: eellison
fbshipit-source-id: 1e6b7b25b7580f09067794772d44e615601c60c4
