patch applied (ghc): fix some problems with the fixup block code

[Simon Marlow]

Thu Jun 29 05:02:10 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * fix some problems with the fixup block code
  We weren't handling InBoth properly.  InBoth needs to be expanded to
  appropriate InReg/InMem locations *before* building the interference
  graph, otherwise an InBoth will not be seen to conflict with other
  InReg/InMem locations.

    M ./compiler/nativeGen/RegisterAlloc.hs -27 +41