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.

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