--- a/src/hotspot/share/gc/z/z_globals.hpp	Mon Jun 10 05:09:52 2019 +0200
+++ b/src/hotspot/share/gc/z/z_globals.hpp	Thu Feb 14 14:54:05 2019 +0100
@@ -82,9 +82,6 @@
   diagnostic(bool, ZVerifyForwarding, false,                                \
           "Verify forwarding tables")                                       \
                                                                             \
-  diagnostic(bool, ZOptimizeLoadBarriers, true,                             \
-          "Apply load barrier optimizations")                               \
-                                                                            \
   develop(bool, ZVerifyLoadBarriers, false,                                 \
           "Verify that reference loads are followed by barriers")