hg: shenandoah/jdk11: JDK11-only: Use WB-based acmp barrier

[roman at kennke.org]

Changeset: 148d8f48af34
Author:    rkennke
Date:      2018-12-06 13:26 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk11/rev/148d8f48af34

JDK11-only: Use WB-based acmp barrier

! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.hpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.hpp
! src/hotspot/share/opto/parse2.cpp
! src/hotspot/share/opto/subnode.cpp
! src/hotspot/share/opto/subnode.hpp