Support get/setstate with no args (#23119)
Summary:
`pickle` supports this and a lot of the quantized use cases for get/set
state follow this pattern
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23119
Pulled By: driazati
Differential Revision: D16391234
fbshipit-source-id: 9f63e0a1679daa61b17aa64b5995e2be23b07b50
