UNDO: Add -fpass-case-bndr-to-join-points

UNDO: Add -fpass-case-bndr-to-join-points

rolling back:

Fri Dec  5 10:51:59 GMT 2008  simonpj@microsoft.com
  * Add -fpass-case-bndr-to-join-points

  See Note [Passing the case binder to join points] in Simplify.lhs
  The default now is *not* to pass the case binder.  There are some
  nofib results with the above note; the effect is almost always
  negligible.

  I don't expect this flag to be used by users (hence no docs). It's just
  there to let me try the performance effects of switching on and off.

    M ./compiler/main/StaticFlagParser.hs +1
    M ./compiler/main/StaticFlags.hs +4
    M ./compiler/simplCore/Simplify.lhs -14 +73