patch applied (ghc-6.8/ghc): Fix Trac #1988; keep the ru_fn field of a RULE up to date

[Ian Lynagh]

Thu Dec 20 05:19:12 PST 2007  simonpj at microsoft.com
  * Fix Trac #1988; keep the ru_fn field of a RULE up to date
  
  The ru_fn field was wrong when we moved RULES from one Id to another.
  The fix is simple enough.
  
  However, looking at this makes me realise that the worker/wrapper stuff
  for recursive newtypes isn't very clever: we generate demand info but
  then don't properly exploit it.  
  
  This patch fixes the crash though.
  

    M ./compiler/basicTypes/IdInfo.lhs -4 +12
    M ./compiler/simplCore/SimplCore.lhs -3 +6
    M ./compiler/simplCore/Simplify.lhs -1 +1