Age the number string cache so it does not keep strings

src/heap.h

Index: src/heap.h
===================================================================
--- src/heap.h	(revision 9686)
+++ src/heap.h	(working copy)
@@ -1419,6 +1419,15 @@
   // around a GC).
   inline void CompletelyClearInstanceofCache();
 
+  // Constants for the NumberStringCache.
+  static const int kNSCUnusedAge = -1;

[Vyacheslav Egorov (Chromium), 2011/10/18 15:30:39]

I don't think abbreviation NSC is good.

+  static const int kNSCMinAge = 0;
+  static const int kNSCMaxAge = 2;
+  static const int kNSCNumberOffset = 0;
+  static const int kNSCStringOffset = 1;
+  static const int kNSCAgeOffset = 2;
+  static const int kNSCSlotsPerEntry = 3;
+
  private:
   Heap();
 
@@ -1688,7 +1697,7 @@
   // Initializes the number to string cache based on the max semispace size.
   MUST_USE_RESULT MaybeObject* InitializeNumberStringCache();
   // Flush the number to string cache.
-  void FlushNumberStringCache();
+  void AgeNumberStringCache();
 
   void UpdateSurvivalRateTrend(int start_new_space_size);