hg: shenandoah/jdk9/hotspot: Push back regions in chunks, not one-by-one, avoids complicated threads dance.

[roman at kennke.org]

Changeset: 8e042a348849
Author:    rkennke
Date:      2016-02-01 12:50 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/8e042a348849

Push back regions in chunks, not one-by-one, avoids complicated threads dance.

! src/share/vm/gc/shenandoah/shenandoahFreeSet.cpp
! src/share/vm/gc/shenandoah/shenandoahFreeSet.hpp
! src/share/vm/gc/shenandoah/shenandoahHeap.cpp