Changes to ghc

Changes to ghc:
commit 22c16eb71c2bf87a555387aca115eae7367df50a
Author: Edward Z. Yang <ezyang@cs.stanford.edu>
Date:   Thu Jun 26 09:24:37 2014 -0700

    Update parallel and stm submodules to have .gitignore

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