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

src/heap.h

Index: src/heap.h
===================================================================
--- src/heap.h	(revision 3073)
+++ src/heap.h	(working copy)
@@ -637,9 +637,6 @@
   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);