Change the representation of existential types to always store a type pointer;  in the case of protocol<>, this replaces the mandatory trivial witness table, and in all other cases it simply grows the representation by a pointer.  We've discussed shrinking the representation by making the witness-table lookup a (cached) lookup from the type metadata;  this needs more investigation.
Change the representation of existential types to always store
a type pointer;  in the case of protocol<>, this replaces the
mandatory trivial witness table, and in all other cases it simply
grows the representation by a pointer.  We've discussed shrinking
the representation by making the witness-table lookup a (cached)
lookup from the type metadata;  this needs more investigation.

Swift SVN r3018

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