Use a dictionary-mode code cache on the map rather than a dual system.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 6e6d893403ce5bbe0c67fef515d3c6121137794b..f90100886dc21274801917f43e2f11919e391aa6 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -853,15 +853,6 @@ Handle<Struct> Factory::NewStruct(InstanceType type) {
 }
 
 
-Handle<CodeCache> Factory::NewCodeCache() {
-  Handle<CodeCache> code_cache =
-      Handle<CodeCache>::cast(NewStruct(CODE_CACHE_TYPE));
-  code_cache->set_default_cache(*empty_fixed_array(), SKIP_WRITE_BARRIER);
-  code_cache->set_normal_type_cache(*undefined_value(), SKIP_WRITE_BARRIER);
-  return code_cache;
-}
-
-
 Handle<AliasedArgumentsEntry> Factory::NewAliasedArgumentsEntry(
     int aliased_context_slot) {
   Handle<AliasedArgumentsEntry> entry = Handle<AliasedArgumentsEntry>::cast(