hg: shenandoah/jdk10/hotspot: Use allocation counter instead of timestamp to track region's age

[zgu at redhat.com]

Changeset: dc9fb6a22845
Author:    zgu
Date:      2017-08-02 14:38 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/hotspot/rev/dc9fb6a22845

Use allocation counter instead of timestamp to track region's age

! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.cpp
! src/share/vm/gc/shenandoah/shenandoahConnectionMatrix.cpp
! src/share/vm/gc/shenandoah/shenandoahHeap.cpp
! src/share/vm/gc/shenandoah/shenandoahHeap.hpp
! src/share/vm/gc/shenandoah/shenandoahHeapRegion.cpp
! src/share/vm/gc/shenandoah/shenandoahHeapRegion.hpp
! src/share/vm/gc/shenandoah/shenandoahHeapRegion.inline.hpp
! src/share/vm/gc/shenandoah/shenandoahPartialGC.cpp