Flush number string cache on GC (bug 1605). Also start with a small

src/heap.h

 // 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 1780 matching lines @@
       JSFunction* function,
       SharedFunctionInfo* shared,
       Object* prototype);
 
   // Total RegExp code ever generated
   double total_regexp_code_generated_;
 
   GCTracer* tracer_;
 
 
-  // Initializes the number to string cache based on the max semispace size.
-  MUST_USE_RESULT MaybeObject* InitializeNumberStringCache();
+  // Allocates a small number to string cache.
+  MUST_USE_RESULT MaybeObject* AllocateInitialNumberStringCache();
+  // Creates and installs the full-sized number string cache.
+  void AllocateFullSizeNumberStringCache();
+  // Get the length of the number to string cache based on the max semispace
+  // size.
+  int FullSizeNumberStringCacheLength();
   // Flush the number to string cache.
   void FlushNumberStringCache();
 
   void UpdateSurvivalRateTrend(int start_new_space_size);
 
   enum SurvivalRateTrend { INCREASING, STABLE, DECREASING, FLUCTUATING };
 
   static const int kYoungSurvivalRateHighThreshold = 90;
   static const int kYoungSurvivalRateLowThreshold = 10;
   static const int kYoungSurvivalRateAllowedDeviation = 15;
@@ skipping 76 matching lines @@
       return true;
     }
     return incremental_marking()->WorthActivating();
   }
 
   // Returns true if no more GC work is left.
   bool IdleGlobalGC();
 
   static const int kInitialSymbolTableSize = 2048;
   static const int kInitialEvalCacheSize = 64;
+  static const int kInitialNumberStringCacheSize = 256;
 
   // Maximum GC pause.
   int max_gc_pause_;
 
   // Maximum size of objects alive after GC.
   intptr_t max_alive_after_gc_;
 
   // Minimal interval between two subsequent collections.
   int min_in_mutator_;
 
@@ skipping 733 matching lines @@
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_