Remove Node dependencies from operator.h (#32682)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32682
This moves code around so that operator.h/cpp no longer requires a full
definition of Node* nor does it include alias analysis or the pretty printer.
This should make it possible to include in the mobile build.
Functionality for checking if operators match Node and to look up
and operator for a Node have moved to the Node object.
Test Plan: Imported from OSS
Differential Revision: D19615386
Pulled By: zdevito
fbshipit-source-id: e38bdf29971183597ef940d061c06ba56e71d9c5
