Doug Gregor bec722df57 [Runtime/IRGen] Switch swift_getExistentialTypeMetadata() to ProtocolDescriptorRef. ...

Switch one entry point in the runtime (swift_getExistentialTypeMetadata)
to use ProtocolDescriptorRef rather than a protocol descriptor. Update
IRGen to produce ProtocolDescriptorRef instances for its calls, setting
the discriminator bit appropriately.

Within the runtime, verify that all instances of ProtocolDescriptorRef have
the right layout, i.e., the discriminator bit is set for @objc protocols
but not Swift protocols.

2018-07-21 07:48:34 -07:00

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