hg: shenandoah/jdk10: Prevent accidental UseShenandoahMatrix enabling

[ashipile at redhat.com]

Changeset: fc0d50757511
Author:    shade
Date:      2018-02-09 17:30 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/fc0d50757511

Prevent accidental UseShenandoahMatrix enabling

! src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.cpp
! src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp