Make PropertyCell::UpdatedType return a handle.

src/objects.h

 // 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 9179 matching lines @@
 
   // Sets the value of the cell and updates the type field to be the union
   // of the cell's current type and the value's type. If the change causes
   // a change of the type of the cell's contents, code dependent on the cell
   // will be deoptimized.
   static void SetValueInferType(Handle<PropertyCell> cell,
                                 Handle<Object> value);
 
   // Computes the new type of the cell's contents for the given value, but
   // without actually modifying the 'type' field.
-  // TODO(mstarzinger): Return value should be handlified.
-  static Type* UpdatedType(Handle<PropertyCell> cell,
-                           Handle<Object> value);
+  static Handle<Type> UpdatedType(Handle<PropertyCell> cell,
+                                  Handle<Object> value);
 
   void AddDependentCompilationInfo(CompilationInfo* info);
 
   void AddDependentCode(Handle<Code> code);
 
   // Casting.
   static inline PropertyCell* cast(Object* obj);
 
   inline Address TypeAddress() {
     return address() + kTypeOffset;
@@ skipping 1206 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_