Robert Widmann c83c0f4cb7 Filter out invalid nested types from typealias override checking ...

The lookupDirect means that we can see type declarations nested inside of a protocol. If we do not filter these invalid declarations, we will offer a bogus fixit on top of a cycle diagnostic.  Remove these types from consideration entirely so we don't crash and don't offer bogus fixits.

Resolves rdar://57003317

2019-11-20 15:17:09 -08:00

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