Fix getOwnPropertyDescriptor() support for index properties.

src/objects.h

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1399 matching lines @@
 
   // Return the object's prototype (might be Heap::null_value()).
   inline Object* GetPrototype();
 
   // Set the object's prototype (only JSObject and null are allowed).
   Object* SetPrototype(Object* value, bool skip_hidden_prototypes);
 
   // Tells whether the index'th element is present.
   inline bool HasElement(uint32_t index);
   bool HasElementWithReceiver(JSObject* receiver, uint32_t index);
-  bool HasLocalElement(uint32_t index);
+
+  // Tells whether the index'th element is present and how it is stored.
+  enum LocalElementType {
+    // There is no element with given index.
+    UNDEFINED_ELEMENT,
+
+    // Element with given index is handled by interceptor.
+    INTERCEPTED_ELEMENT,
+
+    // Element with given index is character in string.
+    STRING_CHARACTER_ELEMENT,
+
+    // Element with given index is stored in fast backing store.
+    FAST_ELEMENT,
+
+    // Element with given index is stored in slow backing store.
+    DICTIONARY_ELEMENT
+  };
+
+  LocalElementType HasLocalElement(uint32_t index);
 
   bool HasElementWithInterceptor(JSObject* receiver, uint32_t index);
   bool HasElementPostInterceptor(JSObject* receiver, uint32_t index);
 
   MUST_USE_RESULT Object* SetFastElement(uint32_t index, Object* value);
 
   // Set the index'th array element.
   // A Failure object is returned if GC is needed.
   MUST_USE_RESULT Object* SetElement(uint32_t index, Object* value);
 
@@ skipping 4140 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_