patch applied (ghc): Refactor error recovery slightly

[Simon Peyton Jones]

Fri Nov  2 06:01:15 PDT 2007  simonpj at microsoft.com
  * Refactor error recovery slightly
  
  Mostly this patch is refacoring, but it also avoids post-tc zonking if
  the typechecker found errors.  This is good because otherwise with
  DEBUG you can get the "Inventing strangely-kinded TyCon" warning.
  

    M ./compiler/typecheck/TcRnDriver.lhs -11 +13
    M ./compiler/typecheck/TcTyClsDecls.lhs -1 +5