Return --harmony-spread-arrays from enabled-by-default to staging

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 28174231ff5d623c286f4073fcdceea319898e3d..26e6a3e1edbb23392a4d02a0945d61a71f696738 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -202,14 +202,14 @@ DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
 #define HARMONY_STAGED(V)                                       \
   V(harmony_tostring, "harmony toString")                       \
   V(harmony_concat_spreadable, "harmony isConcatSpreadable")    \
-  V(harmony_rest_parameters, "harmony rest parameters")
+  V(harmony_rest_parameters, "harmony rest parameters")         \
+  V(harmony_spreadcalls, "harmony spread-calls")                \
+  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)                                             \
   V(harmony_arrow_functions, "harmony arrow functions")                 \
   V(harmony_computed_property_names, "harmony computed property names") \
-  V(harmony_spreadcalls, "harmony spread-calls")                        \
-  V(harmony_spread_arrays, "harmony spread in array literals")          \
   V(harmony_unicode, "harmony unicode escapes")                         \
   V(harmony_object, "harmony Object methods")