hg: shenandoah/jdk10/hotspot: Selectable humongous threshold

[ashipile at redhat.com]

Changeset: 4f91716062dc
Author:    shade
Date:      2017-09-08 16:41 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/hotspot/rev/4f91716062dc

Selectable humongous threshold

! src/share/vm/gc/shenandoah/shenandoahFreeSet.cpp
! src/share/vm/gc/shenandoah/shenandoahHeap.cpp
! src/share/vm/gc/shenandoah/shenandoahHeapRegion.cpp
! src/share/vm/gc/shenandoah/shenandoahHeapRegion.hpp
! src/share/vm/gc/shenandoah/shenandoahMarkCompact.cpp
! src/share/vm/gc/shenandoah/shenandoah_globals.hpp
+ test/gc/shenandoah/HumongousThreshold.java
+ test/gc/shenandoah/options/TestHumongousThresholdArgs.java