hg: shenandoah/jdk8u/hotspot: [backport] PhiNode::has_only_data_users() needs to apply to shenandoah barrier only

[rwestrel at redhat.com]

Changeset: fb33714d09ea
Author:    roland
Date:      2017-09-19 13:41 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/fb33714d09ea

[backport] PhiNode::has_only_data_users() needs to apply to shenandoah barrier only

! src/share/vm/opto/cfgnode.cpp