[Bug debug/80453] [7 Regression] another compare-debug failure

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80453

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
git bisect points to r241329:

commit 34b94be25f231249fa213152feb6b7208b4c0d13
Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed Oct 19 08:39:55 2016 +0000

    2016-10-19  Richard Biener  <rguenther@suse.de>

            * domwalk.c (dom_walker::walk): Use RPO order.