Changes to ghc

Changes to ghc:
commit 014223745186fc0ca6afb9938227df9ce7d28b38
Author: Joachim Breitner <mail@joachim-breitner.de>
Date:   Sun Mar 16 17:12:58 2014 +0100

    Test case: :info Coercible in GHCi

    This prepares against future breakage, especially if #8894 is tackled.