patch applied (ghc): Fix #4074 (I hope).

[Simon Marlow]

Tue May 18 04:32:14 PDT 2010  Simon Marlow <marlowsd at gmail.com>
  * Fix #4074 (I hope).
  
  1. allow multiple threads to call startTimer()/stopTimer() pairs
  2. disable the timer around fork() in forkProcess()
  
  A corresponding change to the process package is required.

    M ./rts/Schedule.c +4
    M ./rts/Timer.c -4 +18

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100518113214-12142-c9a3a11954f6afdb81ddaef3e3e04d4249adf1e3.gz