hg: shenandoah/jdk9/hotspot: Backed out: Avoid updating refs and marking when object is already marked. Avoid double loads and null-checks during marking.

[roman at kennke.org]

Changeset: f286142cc358
Author:    rkennke
Date:      2016-04-06 17:47 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/f286142cc358

Backed out: Avoid updating refs and marking when object is already marked. Avoid double loads and null-checks during marking.

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