Fix GVN for polymorphic loads....

src/hydrogen.h

 // Copyright 2010 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 768 matching lines @@
                                         Handle<String> name);
   void HandlePolymorphicCallNamed(Call* expr,
                                   HValue* receiver,
                                   ZoneMapList* types,
                                   Handle<String> name);
 
   HInstruction* BuildBinaryOperation(BinaryOperation* expr,
                                      HValue* left,
                                      HValue* right);
   HInstruction* BuildIncrement(HValue* value, bool increment);
-  HInstruction* BuildLoadNamedField(HValue* object,
-                                    Property* expr,
-                                    Handle<Map> type,
-                                    LookupResult* result,
-                                    bool smi_and_map_check);
+  HLoadNamedField* BuildLoadNamedField(HValue* object,
+                                       Property* expr,
+                                       Handle<Map> type,
+                                       LookupResult* result,
+                                       bool smi_and_map_check);
   HInstruction* BuildLoadNamedGeneric(HValue* object, Property* expr);
   HInstruction* BuildLoadKeyedFastElement(HValue* object,
                                           HValue* key,
                                           Property* expr);
   HInstruction* BuildLoadKeyedGeneric(HValue* object,
                                       HValue* key);
 
   HInstruction* BuildLoadNamed(HValue* object,
                                Property* prop,
                                Handle<Map> map,
@@ skipping 257 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_