Robert Widmann 3e1a61f425 [NFC] Fold The Tri-State In Optional<ProtocolConformanceRef> ...

ProtocolConformanceRef already has an invalid state.  Drop all of the
uses of Optional<ProtocolConformanceRef> and just use
ProtocolConformanceRef::forInvalid() to represent it.  Mechanically
translate all of the callers and callsites to use this new
representation.

2019-10-29 16:55:56 -07:00

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