patch applied (packages/base): Use unchecked shifts to implement Data.Bits.rotate

[Simon Marlow]

Thu Oct 12 05:55:53 PDT 2006  Samuel Bronson <naesten at gmail.com>
  * Use unchecked shifts to implement Data.Bits.rotate
  This should get rid of those cases, maybe lower the size enough that the inliner will like it?

    M ./Data/Bits.hs -2 +2
    M ./GHC/Int.hs -8 +8
    M ./GHC/Word.hs -9 +9