hg: shenandoah/jdk9/hotspot: replacing barrier's input with barrier's output in all dominated uses breaks with some acmp patterns

[rwestrel at redhat.com]

Changeset: 9f538ba52c19
Author:    roland
Date:      2017-04-18 14:04 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/9f538ba52c19

replacing barrier's input with barrier's output in all dominated uses breaks with some acmp patterns

! src/share/vm/opto/block.hpp
! src/share/vm/opto/shenandoahSupport.cpp