Changes to ghc dph

Changes to ghc:
commit 6074c5da7f48f10e9b3b88d14607ec4955735931
Author: Austin Seipp <austin@well-typed.com>
Date:   Sun Apr 20 01:00:44 2014 -0500

    Remove -fno-warn-amp sledgehammers for validate

    GHC should now fully compliant with respect to the Applicative Monad
    proposal (including all upstream libraries), and does not need to
    suppress this warning anymore.

    Signed-off-by: Austin Seipp <austin@well-typed.com>

Changes to dph:
commit 3ebad521cd1e3b5573d97b483305ca465a9cba69
Author: Austin Seipp <austin@well-typed.com>
Date:   Sun Apr 20 00:59:28 2014 -0500

    dph-lifted-copy: s/join/joinG/ in TH.Repr

    This is the final piece for GHC to be AMP compliant. The use of 'join'
    here is totally internal, so rather than hiding the import, it's just as
    easy to rename to 'joinG' (for the Gen type).

    Signed-off-by: Austin Seipp <austin@well-typed.com>