Make HashNode visible (#34045)
Summary:
HashNode and CompareNode are useful functions for hanlding jit::Node. This is to unblock https://github.com/pytorch/glow/pull/4235.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34045
Reviewed By: houseroad
Differential Revision: D20184733
Pulled By: yinghai
fbshipit-source-id: 6c829f2f111a490fd2d85017475c1731cd97fb20
