Optimize the equality check case of ICCompare stubs.

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 9957)
+++ src/heap.cc	(working copy)
@@ -2368,6 +2368,14 @@
   }
   set_code_stubs(NumberDictionary::cast(obj));
 
+
+  // Allocate the known objects compare stub  dictionary.
+  { MaybeObject* maybe_obj = NumberDictionary::Allocate(4);
+    if (!maybe_obj->ToObject(&obj)) return false;
+  }
+  set_compare_stubs_known_objects(NumberDictionary::cast(obj));
+
+
   // Allocate the non_monomorphic_cache used in stub-cache.cc. The initial size
   // is set to avoid expanding the dictionary during bootstrapping.
   { MaybeObject* maybe_obj = NumberDictionary::Allocate(64);