Changes to ghc

Changes to ghc:
commit 0763a2f2eec4f6d9933fe17ee0d4a3a57823e6bf
Author: Edward Z. Yang <ezyang@cs.stanford.edu>
Date:   Sat Jun 28 11:56:08 2014 +0100

    Fix #9245 by always checking hi-boot for consistency if we find one.

    Summary:
    What this fix does is reorder how we look for hi-boot files: we
    unconditionally check for an hi-boot file, and if we don't find one, we
    check the import graph to see if there was circularity.  This is as
    opposed to the previous scheme (check for circularity, then load hi-boot
    file).

    This costs us an extra file system access every typecheck, which
    is not the best.

    Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

    Test Plan: Validate and check for compiler regressions in nofib

    Reviewers: simonpj, austin

    Subscribers: simonmar, relrod, carter

    Differential Revision: https://phabricator.haskell.org/D30