hg: shenandoah/jdk8u/hotspot: JDK8u-only: Use WB-based acmp barrier

[roman at kennke.org]

Changeset: c2e689bdeaf8
Author:    rkennke
Date:      2018-12-06 13:27 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/c2e689bdeaf8

JDK8u-only: Use WB-based acmp barrier

! src/share/vm/opto/graphKit.cpp
! src/share/vm/opto/graphKit.hpp
! src/share/vm/opto/parse2.cpp
! src/share/vm/opto/shenandoahSupport.cpp
! src/share/vm/opto/subnode.cpp
! src/share/vm/opto/subnode.hpp