Stage harmony-strings.

R=rossberg@chromium.org, yangguo@chromium.org

Review URL: https://codereview.chromium.org/666353002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24810 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/flag-definitions.h

@@ -157,7 +157,6 @@ DEFINE_IMPLICATION(harmony, es_staging)
 #define HARMONY_FEATURES(V)                                       \
   V(harmony_scoping, "harmony block scoping")                     \
   V(harmony_modules, "harmony modules (implies block scoping)")   \
-  V(harmony_strings, "harmony strings")                           \
   V(harmony_arrays, "harmony arrays")                             \
   V(harmony_classes, "harmony classes")                           \
   V(harmony_object_literals, "harmony object literal extensions") \
@@ -166,6 +165,7 @@ DEFINE_IMPLICATION(harmony, es_staging)
   V(harmony_tostring, "harmony Symbol.toStringTag")
 
 #define STAGED_FEATURES(V)              \
+  V(harmony_strings, "harmony strings") \
   V(harmony_numeric_literals, "harmony numeric literals (0o77, 0b11)")
 
 #define SHIPPING_FEATURES(V)