--- old/src/hotspot/share/gc/z/zCollectedHeap.cpp	2020-04-27 10:20:18.543882196 +0200
+++ new/src/hotspot/share/gc/z/zCollectedHeap.cpp	2020-04-27 10:20:18.355879135 +0200
@@ -247,6 +247,10 @@
   _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);
 }