hg: shenandoah/jdk9/hotspot: Added ShenandoahSATBBufferSize experimental flag

[zgu at redhat.com]

Changeset: b2ae3bb580d2
Author:    zgu
Date:      2016-11-23 09:06 -0500
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/b2ae3bb580d2

Added ShenandoahSATBBufferSize experimental flag

! src/share/vm/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/share/vm/gc/shenandoah/shenandoah_globals.hpp