TcPat.tcConPat uses equalities instead of GADT refinement
* This patch implements the use of equality constraints instead of GADT refinements that we have been discussing for a while. * It just changes TcPat.tcConPat. It doesn't have any of the simplification and dead code removal that is possible due to this change. * At the moment, this patch breaks a fair number of GADT regression tests.
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