hg: shenandoah/jdk9/hotspot: Do read barrier and correct load-load-barrier before runtime write barrier. Added debug output.

[roman at kennke.org]

Changeset: c09f8e159415
Author:    rkennke
Date:      2016-07-12 16:06 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/c09f8e159415

Do read barrier and correct load-load-barrier before runtime write barrier. Added debug output.

! src/share/vm/gc/shenandoah/shenandoahBarrierSet.cpp
! src/share/vm/gc/shenandoah/shenandoahConcurrentMark.inline.hpp