--- old/src/hotspot/share/classfile/vmSymbols.cpp	2018-06-08 19:45:19.913105191 +0200
+++ new/src/hotspot/share/classfile/vmSymbols.cpp	2018-06-08 19:45:19.647093649 +0200
@@ -756,6 +756,9 @@
 #endif // COMPILER1
 #ifdef COMPILER2
   case vmIntrinsics::_clone:
+#if INCLUDE_ZGC
+    if (UseZGC) return true;
+#endif
   case vmIntrinsics::_copyOf:
   case vmIntrinsics::_copyOfRange:
     // These intrinsics use both the objectcopy and the arraycopy