Ben Barham 6aa3e0fd00 [SymbolGraph] Determine optional requirement by presence of OptionalAttr ...

Rather than checking the underlying ObjectiveC decl, use the presence of
`OptionalAttr` to determine if a requirement is optional instead. This
is already added by the importer when necessary. An added benefit here
is that this also works for optional requirements defined in Swift (ie.
`@objc optional ...`).

2021-09-25 11:50:53 +10:00

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