Changes to ghc(2)

Changes to ghc:
commit 808ded9c03be25548a8954e61115af5ccd6f2241
Author: Joachim Breitner <mail@joachim-breitner.de>
Date:   Wed Nov 27 16:15:46 2013 +0000

    Get rid of EvCoercible

    and use EvCoercion to describe the evidence for Coercible instances.

commit aef90447a7eb92462f0af5e81f40965fb55fdae7
Author: Joachim Breitner <mail@joachim-breitner.de>
Date:   Wed Nov 27 14:21:43 2013 +0000

    Beginnings of removing EvCoercible