Swapped transition array and descriptor array.

src/runtime.cc

 // Copyright 2012 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 1276 matching lines @@
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_DisableAccessChecks) {
   ASSERT(args.length() == 1);
   CONVERT_ARG_CHECKED(HeapObject, object, 0);
   Map* old_map = object->map();
   bool needs_access_checks = old_map->is_access_check_needed();
   if (needs_access_checks) {
     // Copy map so it won't interfere constructor's initial map.
     Map* new_map;
-    MaybeObject* maybe_new_map = old_map->Copy(DescriptorArray::MAY_BE_SHARED);
+    MaybeObject* maybe_new_map = old_map->Copy();
     if (!maybe_new_map->To(&new_map)) return maybe_new_map;
 
     new_map->set_is_access_check_needed(false);
     object->set_map(new_map);
   }
   return isolate->heap()->ToBoolean(needs_access_checks);
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_EnableAccessChecks) {
   ASSERT(args.length() == 1);
   CONVERT_ARG_CHECKED(HeapObject, object, 0);
   Map* old_map = object->map();
   if (!old_map->is_access_check_needed()) {
     // Copy map so it won't interfere constructor's initial map.
     Map* new_map;
-    MaybeObject* maybe_new_map = old_map->Copy(DescriptorArray::MAY_BE_SHARED);
+    MaybeObject* maybe_new_map = old_map->Copy();
     if (!maybe_new_map->To(&new_map)) return maybe_new_map;
 
     new_map->set_is_access_check_needed(true);
     object->set_map(new_map);
   }
   return isolate->heap()->undefined_value();
 }
 
 
 static Failure* ThrowRedeclarationError(Isolate* isolate,
@@ skipping 12390 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal