Add regression test for https://bugs.swift.org/browse/SR-5056 #18611
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This looks like a subtle issue. It was broken in 4.1 and got fixed in
4.2, perhaps by the decl checker cleanups or some other change.
I don't see many occurrences of 'required convenience' in the
non-executable tests, period, so it's good to have a bit more
coverage for this corner of the language.