hg: shenandoah/jdk9/hotspot: Eliminating _num_regions variable in ShenandoahHeap

[zgu at redhat.com]

Changeset: fe846c4e72e7
Author:    zgu
Date:      2017-06-28 10:22 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/fe846c4e72e7

Eliminating _num_regions variable in ShenandoahHeap

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