Git commits in Moodle 2.8.9 by Jean-Philippe Gaudreau

commit 80764a301f19d39a7ff0a468e6f4e6c5f36f675c
Author: Jean-Philippe Gaudreau <jp.gaudreau@umontreal.ca>
Date:   Tue, 25 Aug 2015 05:05:44 +0800
Tag:    v2.8.9

MDL-51191 assign: Optimizing slow SQL query for MySQL