hg: shenandoah/jdk9/hotspot: Temporarily disable ShenandoahConcurrentEvacCodeRoots, until bugs are fixed

[ashipile at redhat.com]

Changeset: 3f9c3c8ca8a3
Author:    shade
Date:      2017-06-30 22:03 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/3f9c3c8ca8a3

Temporarily disable ShenandoahConcurrentEvacCodeRoots, until bugs are fixed

! src/share/vm/gc/shenandoah/shenandoah_globals.hpp