patch applied (ghc): stgMallocBytesRWX --> allocateExec

[Simon Marlow]

Wed May 31 02:12:02 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * stgMallocBytesRWX --> allocateExec
  Not sure how I left this out of the previous patch, oh well.

    M ./compiler/ghci/ByteCodeItbls.lhs -3 +3