[es6] Stage array spread

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 03d33071f428366dc27d99926072690cb3d25958..3ea476ae77785dd909f00bcc52ab36d47b06493a 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -193,14 +193,14 @@ DEFINE_IMPLICATION(es_staging, harmony)
   V(harmony_unicode_regexps, "harmony unicode regexps")         \
   V(harmony_reflect, "harmony Reflect API")                     \
   V(harmony_destructuring, "harmony destructuring")             \
-  V(harmony_spread_arrays, "harmony spread in array literals")  \
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                               \
   V(harmony_rest_parameters, "harmony rest parameters") \
   V(harmony_spreadcalls, "harmony spread-calls")        \
-  V(harmony_object, "harmony Object methods")
+  V(harmony_object, "harmony Object methods")           \
+  V(harmony_spread_arrays, "harmony spread in array literals")
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                                \