patch applied (ghc): Trim imports, and remove some dead code

[Simon Peyton Jones]

Fri Sep 22 20:52:01 PDT 2006  simonpj at microsoft.com
  * Trim imports, and remove some dead code

    M ./compiler/basicTypes/MkId.lhs -2 +1
    M ./compiler/coreSyn/CoreTidy.lhs -2 +2
    M ./compiler/iface/LoadIface.lhs -2 +1
    M ./compiler/iface/TcIface.lhs -9 +5
    M ./compiler/prelude/PrelRules.lhs -1 +1
    M ./compiler/rename/RnExpr.lhs -3 +2
    M ./compiler/simplCore/Simplify.lhs -8 +4
    M ./compiler/typecheck/TcForeign.lhs -2 +1
    M ./compiler/types/TyCon.lhs -5 +1
    M ./compiler/types/Type.lhs -2 +2
    M ./compiler/types/TypeRep.lhs-boot -4