Canonicalize order of If and Loop outputs (#20015)
Summary:
Canonicalize the ordering of outputs of if and loop nodes based on their first usage. Previously we were able to canonicalize output order by sorting on variable name, but this breaks down with outputs added in an early return pass.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20015
Differential Revision: D15266066
Pulled By: eellison
fbshipit-source-id: ba5340c068a68b1ffc73f056db194b92d3274dc4
