hg: shenandoah/jdk9/hotspot: ShenandoahMinRegionSize should be 256K to allow small heaps.

[ashipile at redhat.com]

Changeset: 710d02eae915
Author:    shade
Date:      2017-03-03 13:28 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/710d02eae915

ShenandoahMinRegionSize should be 256K to allow small heaps.

! src/share/vm/gc/shenandoah/shenandoahHeapRegion.cpp
! src/share/vm/gc/shenandoah/shenandoah_globals.hpp
! test/gc/shenandoah/TestRegionSizeArgs.java