patch applied (ghc): Fix #249 (-caf-all bugs)

[Simon Marlow]

Wed Feb 28 07:50:09 PST 2007  Simon Marlow <simonmar at microsoft.com>
  * Fix #249 (-caf-all bugs)
  There were two bugs:
   * we were generating the symbol name for the CAF
     cost centre from the OccName, which isn't unique enough
     in the case of system-generated non-external names
   * :Main.main caused problems, because we were assuming that
     every top-level CAF was from the current module.

    M ./compiler/profiling/CostCentre.lhs -3 +10
    M ./compiler/profiling/SCCfinal.lhs -2 +8