Preserve constant from ConcreteModuleType to ClassType (#29218)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29218
We need to be able to access constant in module.
Test Plan:
tbd
Imported from OSS
Differential Revision: D18846847
fbshipit-source-id: 22d2c485c3c449bc14ad798f6e1a0c64fc8fb346
