Back out "make the order btw div and mul in adagrad update consistent" (#30737)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30737
Original commit changeset: 2a8b2a3f5401
Reverting this to be safe until we address test failures in T58528495
Test Plan: CI
Reviewed By: wx1988
Differential Revision: D18812384
fbshipit-source-id: 2a3ac554024773022ec827f259127e4c8cffe6e2
