Revert "Convert UnaryOpStub to a HydrogenCodeStub"

src/types.cc

 // Copyright 2013 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 458 matching lines @@
   return from_handle(result);
 }
 
 
 Type* Type::Optional(Handle<Type> type) {
   return type->is_bitset()
       ? from_bitset(type->as_bitset() | kUndefined)
       : Union(type, Undefined()->handle_via_isolate_of(*type));
 }
 
-
-Representation Representation::FromType(Handle<Type> type) {
-  if (type->Is(Type::None())) return Representation::None();
-  if (type->Is(Type::Signed32())) return Representation::Integer32();
-  if (type->Is(Type::Number())) return Representation::Double();
-  return Representation::Tagged();
-}
-
-
 } }  // namespace v8::internal