Jordan Rose ac6fd7214e [Serialization] Recover if a typealias's underlying type is broken (#12979) ...

We could handle a typealias itself disappearing, but not if the
typealias was okay but the underlying type wasn't. This came up in
real Swift 3/4 mix-and-match code.

rdar://problem/34940079

2017-11-16 19:31:13 -08:00

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