patch applied (ghc): Win32 yieldThread(): use SwitchToThread() instead of Sleep(0)

[Simon Marlow]

Wed Jan 27 05:31:06 PST 2010  Simon Marlow <marlowsd at gmail.com>
  * Win32 yieldThread(): use SwitchToThread() instead of Sleep(0)

    M ./rts/win32/OSThreads.c -1 +1

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20100127133106-12142-7fa089880e7d015a031dbaa88f20bb69e2562043.gz