Slava Pestov 53b3a69a9a Runtime: Fix dynamic casts to support resilient protocols ...

If a protocol witness table requires instantiation, the runtime
needs to call the witness table accessor when looking up the
conformance in swift_conformsToProtocol().

We had a bit of code for this already, but it wasn't fully
hooked up. Change IRGen to emit a reference to the witness table
accessor rather than the witness table itself if the witness
table needs instantiation, and add support to the runtime for
calling the accessor.

2016-09-30 18:28:11 -07:00

432 B

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