Changes to ghc

Changes to ghc:
commit 67029f200c5512f8ba5b9b7c25a5d1131422ef8e
Author: Erik de Castro Lopo <erikd@mega-nerd.com>
Date:   Fri Feb 28 18:33:13 2014 +1100

    PPC: Fix loads of PIC data with > 16 bit offsets (#7830).

    Loads should now handle up to 32 bit offsets.