Slava Pestov bbbe307980 SIL: Introduce SILDefaultWitnessTable and start plumbing ...

This will be used to help IRGen record protocol requirements
with resilient default implementations in protocol metadata.

To enable testing before all the Sema support is in place, this
patch adds SIL parser, printer and verifier support for default
witness tables.

For now, SILGen emits empty default witness tables for protocol
declarations in resilient modules, and IRGen ignores them when
emitting protocol metadata.

2016-02-05 20:57:11 -08:00

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