Revert r3514 and r3515. The new cache is too large for some tests...

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 803 matching lines @@
   static bool CreateApiObjects();
 
   // Attempt to find the number in a small cache.  If we finds it, return
   // the string representation of the number.  Otherwise return undefined.
   static Object* GetNumberStringCache(Object* number);
 
   // Update the cache with a new number-string pair.
   static void SetNumberStringCache(Object* number, String* str);
 
   // Entries in the cache.  Must be a power of 2.
-  static const int kNumberStringCacheSize = 16*KB;
+  static const int kNumberStringCacheSize = 64;
 
   // Adjusts the amount of registered external memory.
   // Returns the adjusted value.
   static inline int AdjustAmountOfExternalAllocatedMemory(int change_in_bytes);
 
   // Allocate unitialized fixed array (pretenure == NON_TENURE).
   static Object* AllocateRawFixedArray(int length);
 
   // True if we have reached the allocation limit in the old generation that
   // should force the next GC (caused normally) to be a full one.
@@ skipping 838 matching lines @@
 
   // To speed up scavenge collections new space string are kept
   // separate from old space strings.
   static List<Object*> new_space_strings_;
   static List<Object*> old_space_strings_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_