hg: shenandoah/jdk9/hotspot: fix and improvements to commoning of barriers during loop optimizations

[rwestrel at redhat.com]

Changeset: 0e87bdea9191
Author:    roland
Date:      2016-08-24 09:45 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/0e87bdea9191

fix and improvements to commoning of barriers during loop optimizations

! src/share/vm/gc/shenandoah/shenandoah_globals.hpp
! src/share/vm/opto/cfgnode.cpp
! src/share/vm/opto/compile.cpp
! src/share/vm/opto/graphKit.cpp
! src/share/vm/opto/library_call.cpp
! src/share/vm/opto/loopTransform.cpp
! src/share/vm/opto/loopnode.cpp
! src/share/vm/opto/loopnode.hpp
! src/share/vm/opto/loopopts.cpp
! src/share/vm/opto/shenandoahSupport.cpp
! src/share/vm/opto/shenandoahSupport.hpp
! src/share/vm/opto/superword.cpp