--- old/src/hotspot/share/gc/z/zPage.hpp	2019-02-27 09:29:45.940458336 +0100
+++ new/src/hotspot/share/gc/z/zPage.hpp	2019-02-27 09:29:45.576446673 +0100
@@ -85,7 +85,6 @@
   bool is_in(uintptr_t addr) const;
 
   uintptr_t block_start(uintptr_t addr) const;
-  size_t block_size(uintptr_t addr) const;
   bool block_is_obj(uintptr_t addr) const;
 
   bool is_active() const;