hg: shenandoah/jdk9/hotspot: [backport] Make sure atomic operations are done on "volatile" fields

[ashipile at redhat.com]

Changeset: 2810f11c3bec
Author:    shade
Date:      2017-07-11 23:49 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/2810f11c3bec

[backport] Make sure atomic operations are done on "volatile" fields

! src/share/vm/gc/shared/parallelCleaning.hpp
! src/share/vm/gc/shenandoah/shenandoahCodeRoots.hpp
! src/share/vm/gc/shenandoah/shenandoahConcurrentMark.hpp
! src/share/vm/gc/shenandoah/shenandoahVerifier.cpp