[5.6][lldb] Teach LLDB about ExistentialType in the Swift AST. #3778
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Cherry-pick of #3777
swiftlang/swift#40505 adds a new type called
ExistentialTypeto the Swift frontend, and swiftlang/swift#40804 changes the representation of existential types to use this new type. This is currently semantically the same asProtocolTypeorProtocolCompositionType(the new type actually wraps one of these), so LLDB should handle the new type in the same way.