--- a/src/hotspot/share/code/nmethod.cpp	Wed Dec 05 17:33:01 2018 +0000
+++ b/src/hotspot/share/code/nmethod.cpp	Wed Dec 05 15:57:26 2018 +0100
@@ -1650,7 +1650,8 @@
     }
 #endif
 
-    unload_nmethod_caches(unloading_occurred);
+    guarantee(unload_nmethod_caches(unloading_occurred),
+              "Should not need transition stubs");
   }
 }