A refinement of cl 28068.

Review URL: http://codereview.chromium.org/28069

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1352 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -6953,8 +6953,9 @@ Object* Dictionary::TransformPropertiesToFastFor(JSObject* obj,
 void Script::InitLineEnds() {
   if (!line_ends()->IsUndefined()) return;
 
-  if (source()->IsUndefined()) {
-    set_line_ends(*(Factory::NewArrayLiteral(0)));
+  if (!source()->IsString()) {
+    ASSERT(source()->IsUndefined());
+    set_line_ends(*(Factory::NewJSArray(0)));
     ASSERT(line_ends()->IsJSArray());
     return;
   }