Changes to ghc

Changes to ghc:
commit 87bbc69c40d36046492d754c8d7ff02c3be6ce43
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date:   Tue Mar 18 17:10:18 2014 +0000

    Make sure we occurrence-analyse unfoldings (fixes Trac #8892)

    For DFunUnfoldings we were failing to occurrence-analyse the unfolding,
    and that meant that a loop breaker wasn't marked as such, which in turn
    meant it was inlined away when it still had occurrence sites.  See
    Note [Occurrrence analysis of unfoldings] in CoreUnfold.

    This is a pretty long-standing bug, happily nailed by John Lato.