[pypy-dev] patch for __getattribute__()

Hi! The following patch initiated by a chat with Runar Petursson about descriptors - increases pypy-c/pypy-llvm by 25% on richards.py. I couldnt be bothered creating a branch - but if someone wants to sanity check it and fix the method repr and check it in, you are more than welcome! :-) Cheers, Richard