Git commits in Moodle 3.4.1 by Matt Clarkson

commit 23e190ead50baa2a6337fe53c249b305dabbd941
Author: Matt Clarkson <mattc@catalyst.net.nz>
Date:   Wed, 06 Dec 2017 05:41:01 +0800
Tag:    v3.4.1

MDL-60976 dml: Optimise replace_all_text()