--- old/src/hotspot/share/gc/z/zCollectedHeap.cpp	2020-08-14 20:20:00.866350112 +0200
+++ new/src/hotspot/share/gc/z/zCollectedHeap.cpp	2020-08-14 20:20:00.422342133 +0200
@@ -253,10 +253,6 @@
   _heap.object_iterate(cl, true /* visit_weaks */);
 }
 
-void ZCollectedHeap::run_task(AbstractGangTask* task) {
-  return _heap.run_task(task);
-}
-
 void ZCollectedHeap::keep_alive(oop obj) {
   _heap.keep_alive(obj);
 }