patch applied (ghc): fix bugs in tryTakeMVar/tryPutMVar

[Simon Marlow]

Fri Oct 29 02:04:23 PDT 2010  Simon Marlow <marlowsd at gmail.com>
  * fix bugs in tryTakeMVar/tryPutMVar
  I'm surprised that these haven't caused any problems (or maybe they have?)

    M ./rts/PrimOps.cmm -3 +3

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20101029090423-12142-a31ef01762b044f85268073cedf9bcdac65dd4aa.gz