patch applied (packages/base): add runIOFastExit :: IO a -> IO a

[Simon Marlow]

Mon Mar 20 04:43:33 PST 2006  Simon Marlow <simonmar at microsoft.com>
  * add runIOFastExit :: IO a -> IO a
  Similar to runIO, but calls stg_exit() directly to exit, rather than
  shutdownHaskellAndExit().  Needed for running GHCi in the test suite.

    M ./GHC/TopHandler.lhs -1 +18