hg: shenandoah/jdk10: Passive should opt-in the barriers, not opt-out

[ashipile at redhat.com]

Changeset: ba10ad7ea2c7
Author:    shade
Date:      2017-11-17 15:28 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/ba10ad7ea2c7

Passive should opt-in the barriers, not opt-out

! src/hotspot/share/gc/shenandoah/shenandoahCollectorPolicy.cpp