Don't do binder-swap for GlobalIds

This patch disables the binder-swap transformation in the
(relatively rare) case when the scrutinee is a GlobalId.
Reason: we are getting Lint errors so that GHC doesn't
even validate.  Trac #16346.

This is NOT the final solution -- it's just a stop-gap
to get us running again.

The final solution is in Trac #16296