[swift-dev] Emitting redundant protocol conformances to support type lookup

[Luke Howard]

Would it be possible to extend GenericParameterDescriptor to include a tail-emplaced set of references to ProtocolDescriptors for any parameter type constraints that require witness tables? This would be useful plumbing for a future API that can dynamically instantiate generic types.

See:

https://github.com/lhoward/swift/blob/SR-381/include/swift/Runtime/Metadata.h#L1199 <https://github.com/lhoward/swift/blob/SR-381/include/swift/Runtime/Metadata.h#L1199>

https://github.com/lhoward/swift/blob/SR-381/stdlib/public/runtime/MetadataLookup.cpp#L338 <https://github.com/lhoward/swift/blob/SR-381/stdlib/public/runtime/MetadataLookup.cpp#L338>

— Luke
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