Anthony Latsis afcb1665f8 GSB: Handle concrete ResolvedTypes in ArchetypeType::resolveNestedType() ...

A nested type of an archetype type might be concrete, for example, via a
same-type constraint:

extension SomeProtocol where SomeAssoc == Int {
  ... Self.SomeAssoc ...
}

This can happen in one of two ways; either the EquivalenceClass of the
nested type has a concrete type, or it is "fully concrete" because
there is no equivalence class and maybeResolveEquivalenceClass() returns
a ResolvedType storing the concrete type.

For some reason we didn't handle the second case here.

Fixes https://bugs.swift.org/browse/SR-13519 / rdar://problem/68531679

2021-01-12 23:52:44 -05:00

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