Revert of [es6] Ship new ES6 instanceof operator semantics.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 3b41834f0912768e50dc87caf41283dee8d1f193..7cede492b2074fa84ba0fa76dbaa33e4c1f72969 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -211,6 +211,7 @@
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                                    \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind")                  \
+  V(harmony_instanceof, "harmony instanceof support")                        \
   V(harmony_object_values_entries, "harmony Object.values / Object.entries") \
   V(harmony_object_own_property_descriptors,                                 \
     "harmony Object.getOwnPropertyDescriptors()")                            \
@@ -219,7 +220,6 @@
 #define HARMONY_SHIPPING(V)                                           \
   V(harmony_array_prototype_values, "harmony Array.prototype.values") \
   V(harmony_function_name, "harmony Function name inference")         \
-  V(harmony_instanceof, "harmony instanceof support")                 \
   V(harmony_iterator_close, "harmony iterator finalization")          \
   V(harmony_regexps, "harmony regular expression extensions")         \
   V(harmony_unicode_regexps, "harmony unicode regexps")               \