[esnext] stage --harmony-string-padding

BUG=v8:4954
LOG=Y
R=littledan@chromium.org

Review-Url: https://codereview.chromium.org/1932453002
Cr-Commit-Position: refs/heads/master@{#35836}

src/flag-definitions.h

@@ -199,8 +199,7 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")    \
   V(harmony_simd, "harmony simd")                              \
   V(harmony_do_expressions, "harmony do-expressions")          \
-  V(harmony_regexp_property, "harmony unicode regexp property classes") \
-  V(harmony_string_padding, "harmony String-padding methods")
+  V(harmony_regexp_property, "harmony unicode regexp property classes")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                                    \
@@ -209,7 +208,8 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
   V(harmony_for_in, "harmony for-in syntax")                                 \
   V(harmony_object_values_entries, "harmony Object.values / Object.entries") \
   V(harmony_object_own_property_descriptors,                                 \
-    "harmony Object.getOwnPropertyDescriptors()")
+    "harmony Object.getOwnPropertyDescriptors()")                            \
+  V(harmony_string_padding, "harmony String-padding methods")
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                           \