Changes to ghc

Changes to ghc:
commit 5031772861a64dd2d4f6dc047add31b3231b2a52
Author: Edward Z. Yang <ezyang@cs.stanford.edu>
Date:   Fri Jun 27 14:06:51 2014 +0100

    Revert "Make -fno-write-interface to all modes of GHC, not just -fno-code."

    This reverts commit 05120ecd95b2ebf9b096a95304793cd78be9506e.