--- old/src/share/vm/gc/g1/g1ConcurrentMark.cpp	2017-08-03 16:11:05.485643191 -0700
+++ new/src/share/vm/gc/g1/g1ConcurrentMark.cpp	2017-08-03 16:11:05.353643196 -0700
@@ -1718,7 +1718,7 @@
     // Reference lists are balanced (see balance_all_queues() and balance_queues()).
     rp->set_active_mt_degree(active_workers);
 
-    ReferenceProcessorPhaseTimes pt(_gc_timer_cm, rp->num_q(), rp->processing_is_mt());
+    ReferenceProcessorPhaseTimes pt(_gc_timer_cm, rp->num_q());
 
     // Process the weak references.
     const ReferenceProcessorStats& stats =