Shenandoah disabled barriers blocks omit LRB

There are missing clauses that check/disable LRB in initial Shenandoah configuration.

diff -r 3a75a903a488 src/hotspot/share/gc/shenandoah/shenandoahArguments.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahArguments.cpp Mon May 06 19:20:26 2019 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoahArguments.cpp Mon May 06 19:25:02 2019 +0200
@@ -45,6 +45,7 @@
   FLAG_SET_DEFAULT(ShenandoahGCHeuristics, "passive");
 
   FLAG_SET_DEFAULT(ShenandoahSATBBarrier, false);
+ FLAG_SET_DEFAULT(ShenandoahLoadRefBarrier, false);
   FLAG_SET_DEFAULT(ShenandoahKeepAliveBarrier, false);
   FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, false);
   FLAG_SET_DEFAULT(ShenandoahCASBarrier, false);
@@ -106,6 +107,7 @@
   // C2 barrier verification is only reliable when all default barriers are enabled
   if (ShenandoahVerifyOptoBarriers &&
           (!FLAG_IS_DEFAULT(ShenandoahSATBBarrier) ||
+ !FLAG_IS_DEFAULT(ShenandoahLoadRefBarrier) ||
            !FLAG_IS_DEFAULT(ShenandoahKeepAliveBarrier) ||
            !FLAG_IS_DEFAULT(ShenandoahStoreValEnqueueBarrier) ||
            !FLAG_IS_DEFAULT(ShenandoahCASBarrier) ||