Do not do post GC processing for scavenges....

src/heap.h

 // Copyright 2006-2008 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 619 matching lines @@
   // Converts the given boolean condition to JavaScript boolean value.
   static Object* ToBoolean(bool condition) {
     return condition ? true_value() : false_value();
   }
 
   // Code that should be run before and after each GC.  Includes some
   // reporting/verification activities when compiled with DEBUG set.
   static void GarbageCollectionPrologue();
   static void GarbageCollectionEpilogue();
 
-  // Code that should be executed after the garbage collection proper.
-  static void PostGarbageCollectionProcessing();
-
   // Performs garbage collection operation.
   // Returns whether required_space bytes are available after the collection.
   static bool CollectGarbage(int required_space, AllocationSpace space);
 
   // Performs a full garbage collection. Force compaction if the
   // parameter is true.
   static void CollectAllGarbage(bool force_compaction);
 
   // Performs a full garbage collection if a context has been disposed
   // since the last time the check was performed.
@@ skipping 939 matching lines @@
   }
   static TranscendentalCache* caches_[kNumberOfCaches];
   Element elements_[kCacheSize];
   Type type_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_