Changes to ghc

Changes to ghc:
commit 063a1b25459a9f1576bd5c29b6aa931b6b3da690
Author: Joachim Breitner <mail@joachim-breitner.de>
Date:   Fri Jan 10 14:22:41 2014 +0000

    Notes and code cosmetics

    Explain why defaultDmd resTypeArgDmd are similar, but both needed, and
    apply slight code cosmetics.