[ParseableInterfaces] Handle unsatisfiable conditional conformances #20433
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...by printing them with a dummy, unsatisfiable condition. This happens when a public type conforms to a public protocol with non-public conditions; the conformance can't be used in inlinable code, but neither is it okay for a client to declare their own conformance (constrained or unconstrained).
rdar://problem/45657450. See also the forum thread at https://forums.swift.org/t/parseable-interfaces-conditional-conformances-with-non-public-conditions-are-problematic/17747/.