[m-dev.] for review: use type_ctor_rep for unify, index and compare

[Warwick Harvey]

Zoltan wrote:
> Change the way unify, index and compare work. Instead of always calling the
> type-specific unification, index and comparison procedures, do a dispatch
> on the type_ctor_rep instead, and call the type-specific routine only
> if necessary. Also, specialize the common cases of type_ctors of arity
> 0, 1 and 2. This gives us a speedup of about 3 or 4 percent.

This change looks fine to me (once I figured out it wasn't doing what I 
thought it was supposed to ;-).

May I enquire on which machine you ran the benchmarks?

Warwick

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