sort intermediate supras for fast intersection bailout

[garfieldnate]

Given how huge I remember non-classified supracontexts being, this may not help, but it's worth an experiment.

At the lattice combination stage, sort the supracontexts in each sub lattice by the set of outcomes used by its subcontexts. Then when combination is performed perhaps we can find a way to cut out extra work. For example, if a supra contains only subs with the outcomes [e,f,g], we wouldn't need to bother trying to combine with supras that only contain [h,i,j].

This has the potential to make everything slower if not done right, so further thought is required.

[garfieldnate]

Possibly interesting reference: http://lemire.me/blog/2015/03/25/accelerating-intersections-with-simd-instructions/