[C++ PATCH] Kill OVL_CURRENT, OVL_NEXT

[Nathan Sidwell]

This patch finally expunges OVL_CURRENT & OVL_NEXT.  Everything's 
switched over to using the new iterators.

The use in check_explicit_specialization is temporary, until I enable 2D 
overload sets, and then it'll just use lookup_add on the overload set.

nathan
-- 
Nathan Sidwell
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