Refactoring only: Make the handling of PropertyType more explicit.

src/objects.h

 // Copyright 2011 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 189 matching lines @@
 
   // Conversion for storing details as Object*.
   explicit inline PropertyDetails(Smi* smi);
   inline Smi* AsSmi();
 
   PropertyType type() { return TypeField::decode(value_); }
 
   bool IsTransition() {
     PropertyType t = type();
     ASSERT(t != INTERCEPTOR);
-    return t == MAP_TRANSITION || t == CONSTANT_TRANSITION ||
-        t == ELEMENTS_TRANSITION;
+    return IsTransitionType(t);
   }
 
   bool IsProperty() {
     return type() < FIRST_PHANTOM_PROPERTY_TYPE;
   }
 
   PropertyAttributes attributes() { return AttributesField::decode(value_); }
 
   int index() { return StorageField::decode(value_); }
 
@@ skipping 7716 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_