Changes to ghc ghc-prim

Changes to ghc:
commit d53ccab6ab32df38c0c226dea51f702f20d4feb3
Author: Joachim Breitner <mail@joachim-breitner.de>
Date:   Fri Mar 14 12:26:26 2014 +0100

    Another reference to Note [Kind-changing of (~) and Coercible]

Changes to ghc-prim:
commit b19daeb18c2c64ef2207f70806048c5288e1333c
Author: Joachim Breitner <mail@joachim-breitner.de>
Date:   Fri Mar 14 12:26:14 2014 +0100

    Better Comment [Kind-changing of (~) and Coercible]