hg: shenandoah/jdk9/hotspot: Concurrent preclean.

[ashipile at redhat.com]

Changeset: add34cede0df
Author:    shade
Date:      2017-05-31 14:46 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/add34cede0df

Concurrent preclean.

! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.cpp
! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.hpp
! src/share/vm/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/share/vm/gc/shenandoah/shenandoahConcurrentMark.hpp
! src/share/vm/gc/shenandoah/shenandoahConcurrentThread.cpp
! src/share/vm/gc/shenandoah/shenandoah_globals.hpp