--- old/src/hotspot/share/gc/shared/c2/cardTableBarrierSetC2.cpp	2018-09-28 11:01:44.403163050 +0200
+++ new/src/hotspot/share/gc/shared/c2/cardTableBarrierSetC2.cpp	2018-09-28 11:01:35.172140943 +0200
@@ -186,6 +186,7 @@
   }
 }
 
-bool CardTableBarrierSetC2::array_copy_requires_gc_barriers(BasicType type) const {
-  return !use_ReduceInitialCardMarks();
+bool CardTableBarrierSetC2::array_copy_requires_gc_barriers(bool tightly_coupled_alloc, BasicType type, bool is_clone, ArrayCopyPhase phase) const {
+  bool is_oop = type == T_OBJECT || type == T_ARRAY;
+  return is_oop && (!tightly_coupled_alloc || !use_ReduceInitialCardMarks());
 }