Changes to ghc

Changes to ghc:
commit 55e7ab1210975e6276f3cab3ac0e1f35bcd772f0
Author: Gintautas Miliauskas <gintautas.miliauskas@gmail.com>
Date:   Sun Jun 8 11:49:29 2014 +0000

    Do not print the result of 'main' after invoking ':main' (fixes #9086).