Changes to ghc

Changes to ghc:
commit 07388af843ad61757207a54d75ab336606beed4f
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Thu Apr 24 09:05:45 2014 +0200

    Drop `template-haskell`'s build-dep on `containers`

    This is an attempt to address

      https://github.com/haskell/cabal/issues/1811

    by replicating the less than 100 lines of code actually used from the
    containers package into an internal non-exposed `template-haskell` module.

    Moreover, `template-haskell` does not expose the `Map` type, so this change
    should have no visible effect on the public API.

    It may turn out that `Data.Map` is not necessary and that even a simple
    list-based associative list (`Prelude.lookup`) may suffice. However, in
    order to avoid any regressions, this commit takes the safe route and just
    clones `Data.Map` for now.

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>