John McCall 89e60f31aa Add protocol witness tables to existential metatype ...

layouts.  Introduce new SIL instructions to initialize
and open existential metatype values.

Don't actually, y'know, lift any of the restriction on
existential metatypes; just pointlessly burn extra
memory storing them.

Swift SVN r22592

2014-10-08 01:20:13 +00:00

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