swift234

Remove the remaining bucketing in the generic specializer.

As with r26754, this is another step towards simplifying the generic
specializer interface. Since we now properly mangle and can therefore
test if we already have a specialization of this function, we no longer
need to do the bucketing to avoid duplicated work.

The stdlib build is as fast or faster, and the only diffs I see appear
to be either function ordering, UUIDs, or the bit of non-determinism
I've seen in block ordering.

Swift SVN r26765