Changes to ghc

Changes to ghc:
commit fc5aa5d8a0a7c7fc57cfe268f1e051e14c90b93b
Author: Simon Marlow <marlowsd@gmail.com>
Date:   Mon Mar 24 14:36:16 2014 +0000

    Use the correct callClobberedRegs on Windows/x64 (#8834)

    Signed-off-by: Austin Seipp <austin@well-typed.com>
    (cherry picked from commit c4eeacdfdf4578eb6e75bbf2e067bfe70ec94ab0)