patch applied (ghc): Fix truncate on amd64 NCG; fixes arith005.

[Ian Lynagh]

Thu May  3 15:38:33 PDT 2007  Ian Lynagh <igloo at earth.li>
  * Fix truncate on amd64 NCG; fixes arith005.
  cvts[sd]2siq? ->
  cvtts[sd]2siq?

    M ./compiler/nativeGen/MachCodeGen.hs -1 +3
    M ./compiler/nativeGen/MachInstrs.hs -2 +2
    M ./compiler/nativeGen/PprMach.hs -6 +6
    M ./compiler/nativeGen/RegAllocInfo.hs -4 +4