Change JSObject elements to be of type FixedArrayBase

src/objects.cc

 // Copyright 2011 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 8389 matching lines @@
       } else {
         Handle<Object> number = isolate->factory()->NewNumberFromUint(index);
         Handle<String> name = isolate->factory()->NumberToString(number);
         Handle<Object> args[1] = { name };
         Handle<Object> error =
             isolate->factory()->NewTypeError("object_not_extensible",
                                              HandleVector(args, 1));
         return isolate->Throw(*error);
       }
     }
-    Object* new_dictionary;
+    FixedArrayBase* new_dictionary;
     MaybeObject* maybe = dictionary->AtNumberPut(index, value);
-    if (!maybe->ToObject(&new_dictionary)) return maybe;
+    if (!maybe->To<FixedArrayBase>(&new_dictionary)) return maybe;
     if (dictionary != NumberDictionary::cast(new_dictionary)) {
       if (is_arguments) {
         elements->set(1, new_dictionary);
       } else {
-        set_elements(HeapObject::cast(new_dictionary));
+        set_elements(new_dictionary);
       }
       dictionary = NumberDictionary::cast(new_dictionary);
     }
   }
 
   // Update the array length if this JSObject is an array.
   if (IsJSArray()) {
     MaybeObject* result =
         JSArray::cast(this)->JSArrayUpdateLengthFromIndex(index, value);
     if (result->IsFailure()) return result;
@@ skipping 3158 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single break point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal