Support loads from primitive values.

src/ic.cc

 // Copyright 2012 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 1190 matching lines @@
       // There is only one shared stub for loading normalized
       // properties. It does not traverse the prototype chain, so the
       // property must be found in the object for the stub to be
       // applicable.
       if (!object.is_identical_to(holder)) break;
       return isolate()->builtins()->LoadIC_Normal();
     case CALLBACKS: {
       // Use simple field loads for some well-known callback properties.
       if (object->IsJSObject()) {
         Handle<JSObject> receiver = Handle<JSObject>::cast(object);
-        Handle<Map> map(receiver->map());
+        Handle<HeapType> type = IC::MapToType(handle(receiver->map()));
         int object_offset;
-        if (Accessors::IsJSObjectFieldAccessor(map, name, &object_offset)) {
+        if (Accessors::IsJSObjectFieldAccessor(type, name, &object_offset)) {
           return SimpleFieldLoad(object_offset / kPointerSize);
         }
       }
 
       Handle<Object> callback(lookup->GetCallbackObject(), isolate());
       if (callback->IsExecutableAccessorInfo()) {
         Handle<ExecutableAccessorInfo> info =
             Handle<ExecutableAccessorInfo>::cast(callback);
         if (v8::ToCData<Address>(info->getter()) == 0) break;
         if (!info->IsCompatibleReceiver(*object)) break;
@@ skipping 1948 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal