Decrease the kHashbits to 12 effectively restoring the pre-r89459 size

third_party/tcmalloc/chromium/src/packed-cache-inl.h

Index: third_party/tcmalloc/chromium/src/packed-cache-inl.h
===================================================================
--- third_party/tcmalloc/chromium/src/packed-cache-inl.h	(revision 89657)
+++ third_party/tcmalloc/chromium/src/packed-cache-inl.h	(working copy)
@@ -139,7 +139,9 @@
   // Decrease the size map cache if running in the small memory mode.
   static const int kHashbits = 12;
 #else
-  static const int kHashbits = 16;
+  // We don't want the hash map to occupy 512K memory at Chromium, so
+  // kHashbits is decreased from 16 to 12.

[jar (doing other things), 2011/06/20 16:45:02]

Question: Rather than forking this file, why don't we just work to set the
TCMALLOC_SMALL_SLOW flag (in Chromium), and get this without a file change?

+  static const int kHashbits = 12;
 #endif
   static const int kValuebits = 7;
   static const bool kUseWholeKeys = kKeybits + kValuebits <= 8 * sizeof(T);