Support CreateDataProperty on JSObject in the runtime

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 79a8fbafbe8769104feef8626efb7ff82b8db7ff..7868b4d473b4ed9ea8220a09a549851cfca2ddd8 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1864,6 +1864,11 @@ class JSObject: public JSReceiver {
       PropertyAttributes attributes = NONE,
       ExecutableAccessorInfoHandling handling = DEFAULT_HANDLING);
 
+  // Adds or reconfigures a property to attributes NONE. It will fail when it
+  // cannot.
+  MUST_USE_RESULT static Maybe<bool> CreateDataProperty(LookupIterator* it,
+                                                        Handle<Object> value);
+
   static void AddProperty(Handle<JSObject> object, Handle<Name> name,
                           Handle<Object> value, PropertyAttributes attributes);