hg: shenandoah/jdk9/hotspot: Replace ShHeapRegionSet::get with get_fast.

[ashipile at redhat.com]

Changeset: 521309883e98
Author:    shade
Date:      2017-05-04 19:03 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/521309883e98

Replace ShHeapRegionSet::get with get_fast.

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