diff -r f31dad87f661 -r 70f114974aa7 src/hotspot/share/opto/c2_globals.hpp
--- a/src/hotspot/share/opto/c2_globals.hpp	Wed Feb 06 16:02:27 2019 +0100
+++ b/src/hotspot/share/opto/c2_globals.hpp	Tue Feb 12 09:00:04 2019 +0100
@@ -509,9 +509,6 @@
   product(bool, EliminateAutoBox, true,                                     \
           "Control optimizations for autobox elimination")                  \
                                                                             \
-  diagnostic(bool, UseImplicitStableValues, true,                           \
-          "Mark well-known stable fields as such (e.g. String.value)")      \
-                                                                            \
   product(intx, AutoBoxCacheMax, 128,                                       \
           "Sets max value cached by the java.lang.Integer autobox cache")   \
           range(0, max_jint)                                                \