--- old/src/hotspot/share/gc/z/zUtils.hpp	2019-07-26 14:17:30.677384002 +0200
+++ new/src/hotspot/share/gc/z/zUtils.hpp	2019-07-26 14:17:30.441376256 +0200
@@ -39,6 +39,9 @@
   static size_t bytes_to_words(size_t size_in_words);
   static size_t words_to_bytes(size_t size_in_words);
 
+  // Memory
+  static void zero(uintptr_t addr, size_t size);
+
   // Object
   static size_t object_size(uintptr_t addr);
   static void object_copy(uintptr_t from, uintptr_t to, size_t size);