Use original module's class name for ScriptModules (#22873)
Summary:
Since recursive script creates a ScriptModule from an `nn.Module`,
there's no ties to the original module to pull a type name from, so we
have to explicitly pass it in.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22873
Pulled By: driazati
Differential Revision: D16268547
fbshipit-source-id: 902a30e6e36427c6ba7033ded027a29d9dcbc1ee
