Changes to ghc

Changes to ghc:
commit 7400810e3fb0af85da0cfb2b940bfe563687863f
Author: Austin Seipp <austin@well-typed.com>
Date:   Tue Apr 29 09:59:01 2014 -0500

    Revert "rts: Add an initial Coverity model"

    This reverts commit 4539400a72ded7fa69149b28cfa9c84464f4739d.