Fix bad merge in "Remove unnecessary use of ArchetypeType::isSelfDerived()"
Fix bad merge in "Remove unnecessary use of ArchetypeType::isSelfDerived()"

The old code was still there, but dead, because it came after the 'return'.
This fixes a compile error now that the method really has been removed.

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb