Changes to ghc

Changes to ghc:
commit f0fcc41d755876a1b02d1c7c79f57515059f6417
Author: Simon Marlow <marlowsd@gmail.com>
Date:   Sun May 4 20:27:42 2014 +0100

    Revert "Per-thread allocation counters and limits"

    Problems were found on 32-bit platforms, I'll commit again when I have a fix.

    This reverts the following commits:
       54b31f744848da872c7c6366dea840748e01b5cf
       b0534f78a73f972e279eed4447a5687bd6a8308e