Reapplying r5147 (caching maps for slow case objects)....

src/ic.cc

 // Copyright 2006-2009 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 147 matching lines @@
 
   if (state != MONOMORPHIC) return state;
   if (receiver->IsUndefined() || receiver->IsNull()) return state;
 
   InlineCacheHolderFlag cache_holder =
       Code::ExtractCacheHolderFromFlags(target->flags());
 
 
   if (cache_holder == OWN_MAP && !receiver->IsJSObject()) {
     // The stub was generated for JSObject but called for non-JSObject.
-    // IC::GetCodeCacheMap is not applicable.
+    // IC::GetCodeCacheHolder is not applicable.
     return MONOMORPHIC;
   } else if (cache_holder == PROTOTYPE_MAP &&
              receiver->GetPrototype()->IsNull()) {
-    // IC::GetCodeCacheMap is not applicable.
+    // IC::GetCodeCacheHolder is not applicable.
     return MONOMORPHIC;
   }
-  Map* map = IC::GetCodeCacheMap(receiver, cache_holder);
+  Map* map = IC::GetCodeCacheHolder(receiver, cache_holder)->map();
 
   // Decide whether the inline cache failed because of changes to the
   // receiver itself or changes to one of its prototypes.
   //
   // If there are changes to the receiver itself, the map of the
   // receiver will have changed and the current target will not be in
   // the receiver map's code cache.  Therefore, if the current target
   // is in the receiver map's code cache, the inline cache failed due
   // to prototype check failure.
   int index = map->IndexInCodeCache(name, target);
@@ skipping 1632 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal