--- old/src/hotspot/share/gc/z/zUtils.inline.hpp	2019-07-26 14:17:31.019395227 +0200
+++ new/src/hotspot/share/gc/z/zUtils.inline.hpp	2019-07-26 14:17:30.785387547 +0200
@@ -56,6 +56,10 @@
   return size_in_words << LogBytesPerWord;
 }
 
+inline void ZUtils::zero(uintptr_t addr, size_t size) {
+  Copy::zero_to_bytes((void*)addr, size);
+}
+
 inline size_t ZUtils::object_size(uintptr_t addr) {
   return words_to_bytes(ZOop::from_address(addr)->size());
 }