hg: shenandoah/jdk8u/hotspot: [backport] Periodic GC

[ashipile at redhat.com]

Changeset: 12e6caf5607b
Author:    shade
Date:      2017-08-09 01:05 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/12e6caf5607b

[backport] Periodic GC

! src/share/vm/gc_implementation/shenandoah/shenandoahCollectorPolicy.cpp
! src/share/vm/gc_implementation/shenandoah/shenandoah_globals.hpp
+ test/gc/shenandoah/TestPeriodicGC.java