patch applied (ghc): Try harder to avoid making a variable with RULES into a loop-breaker

[Simon Peyton Jones]

Mon Jul  2 06:24:31 PDT 2007  simonpj at microsoft.com
  * Try harder to avoid making a variable with RULES into a loop-breaker
  
  See Note [Recursive rules] in OccurAnal
  

    M ./compiler/simplCore/OccurAnal.lhs -6 +27
    M ./compiler/simplCore/Simplify.lhs +2