hg: shenandoah/jdk9/hotspot: Use scoped object for gc session/phases recording

[zgu at redhat.com]

Changeset: d3edf41ae2dc
Author:    zgu
Date:      2017-06-13 13:02 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/d3edf41ae2dc

Use scoped object for gc session/phases recording

! src/share/vm/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/share/vm/gc/shenandoah/shenandoahConcurrentThread.cpp
! src/share/vm/gc/shenandoah/shenandoahHeap.cpp
! src/share/vm/gc/shenandoah/shenandoahMarkCompact.cpp
! src/share/vm/gc/shenandoah/shenandoahPartialGC.cpp
+ src/share/vm/gc/shenandoah/shenandoahUtils.cpp
+ src/share/vm/gc/shenandoah/shenandoahUtils.hpp
! src/share/vm/gc/shenandoah/vm_operations_shenandoah.cpp