hg: shenandoah/jdk9/hotspot: missing barriers on constant oops + acmp rework + cas fix + write barrier on constant oop fix

[rwestrel at redhat.com]

Changeset: 6a90a442d2ae
Author:    roland
Date:      2017-06-27 11:11 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/6a90a442d2ae

missing barriers on constant oops + acmp rework + cas fix + write barrier on constant oop fix

! src/cpu/x86/vm/x86_64.ad
! src/share/vm/gc/shenandoah/shenandoah_globals.hpp
! src/share/vm/opto/arraycopynode.cpp
! src/share/vm/opto/graphKit.cpp
! src/share/vm/opto/graphKit.hpp
! src/share/vm/opto/library_call.cpp
! src/share/vm/opto/loopopts.cpp
! src/share/vm/opto/machnode.cpp
! src/share/vm/opto/parse2.cpp
! src/share/vm/opto/shenandoahSupport.cpp
! src/share/vm/opto/shenandoahSupport.hpp
! src/share/vm/opto/stringopts.cpp
! src/share/vm/opto/subnode.cpp