hg: shenandoah/jdk8u/hotspot: [backport] Update ShenandoahHeapSampling to avoid double counting.

[ashipile at redhat.com]

Changeset: 836fc0675cfb
Author:    shade
Date:      2017-05-09 18:30 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/836fc0675cfb

[backport] Update ShenandoahHeapSampling to avoid double counting.

! src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegionCounters.cpp
! src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegionCounters.hpp