--- a/src/hotspot/share/gc/z/zCollectedHeap.cpp	Tue Apr 02 10:04:25 2019 +0200
+++ b/src/hotspot/share/gc/z/zCollectedHeap.cpp	Tue Apr 02 10:04:25 2019 +0200
@@ -110,6 +110,10 @@
   return is_in_reserved(p) && _heap.is_in((uintptr_t)p);
 }
 
+uint32_t ZCollectedHeap::hash_oop(oop obj) const {
+  return _heap.hash_oop(obj);
+}
+
 HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) {
   const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size));
   const uintptr_t addr = _heap.alloc_tlab(size_in_bytes);