Changes to ghc

Changes to ghc:
commit c3e7823e560bc4f95b48a6e76f736d875d3937b6
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Sun Nov 3 09:41:43 2013 +0100

    Silence two AMP warnings

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>