hg: shenandoah/jdk9/hotspot: [backport] Uncommit heap regions after given delay

[ashipile at redhat.com]

Changeset: ef1b49ab74c8
Author:    shade
Date:      2017-08-09 20:06 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/ef1b49ab74c8

[backport] Uncommit heap regions after given delay

! src/share/vm/gc/shenandoah/shenandoahConcurrentThread.cpp
! src/share/vm/gc/shenandoah/shenandoahFreeSet.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/shenandoahMarkCompact.cpp
! src/share/vm/gc/shenandoah/shenandoahVerifier.cpp
! src/share/vm/gc/shenandoah/shenandoah_globals.hpp
! src/share/vm/runtime/arguments.cpp
! src/share/vm/services/shenandoahMemoryPool.cpp
+ test/gc/shenandoah/acceptance/HeapUncommit.java