Doug Gregor 89343e2c98 [Coding] Make Codable conformances for Optional and collections conditional. ...

Array, Set, Dictionary, and Optional all provide unconditional conformances
to Encodable & Decodable that dynamically check whether their type arguments
are Encodable/Decodable. Now that we have conditional conformances, make
these unconditional conformances properly conditional, removing all of
the Swift 4-era type-erasure hacks.

Fixes rdar://problem/34989162.

2017-11-30 11:06:29 -08:00

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