Changes to ghc(2)

Changes to ghc:
commit bd79b98774f50c8252d139690bce2bb221a59cd8
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date:   Mon Apr 7 15:22:46 2014 +0100

    Update long-out-of-date performance numbers on 32-bit

    Many are improvements!

commit d8d798b1b33ab0593ed03f193360b8725ba2c2ba
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date:   Mon Apr 7 15:22:11 2014 +0100

    Small issue with signatures in a TH splice (fixes Trac #8932)