hg: shenandoah/jdk9/hotspot: more barrier on constant oop fixes + couple small unrelated fixes

[rwestrel at redhat.com]

Changeset: 0280165be874
Author:    roland
Date:      2017-06-14 21:22 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/0280165be874

more barrier on constant oop fixes + couple small unrelated fixes

! src/share/vm/opto/cfgnode.cpp
! src/share/vm/opto/machnode.cpp
! src/share/vm/opto/shenandoahSupport.cpp
! src/share/vm/opto/shenandoahSupport.hpp