Avoid map transitions and multiple backing arrays for builtin prototypes...

src/heap.cc

 // Copyright 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 259 matching lines @@
 #endif
 
 #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING)
   ReportStatisticsBeforeGC();
 #endif
 }
 
 int Heap::SizeOfObjects() {
   int total = 0;
   AllSpaces spaces;
-  while (Space* space = spaces.next()) total += space->Size();
+  while (Space* space = spaces.next()) {
+    total += space->Size();
+  }
   return total;
 }
 
 void Heap::GarbageCollectionEpilogue() {
 #ifdef DEBUG
   allow_allocation(true);
   ZapFromSpace();
 
   if (FLAG_verify_heap) {
     Verify();
@@ skipping 3574 matching lines @@
 #ifdef DEBUG
 bool Heap::GarbageCollectionGreedyCheck() {
   ASSERT(FLAG_gc_greedy);
   if (Bootstrapper::IsActive()) return true;
   if (disallow_allocation_failure()) return true;
   return CollectGarbage(0, NEW_SPACE);
 }
 #endif
 
 } }  // namespace v8::internal