Jordan Rose af67204b51 [Serialization] Handle XREFs to private types (#14352) ...

We can encounter these when the compiler modifies an inlinable
function to break apart a struct and the struct uses a private
type for one of its fields. It's questionable whether we /should/
handle this, but meanwhile this /is/ a non-intrusive fix that
preserves the performance of non-resilient libraries.

(That is, it appears this worked in Swift 4.0, though perhaps
not all of the same optimizations kicked in.)

https://bugs.swift.org/browse/SR-6874

2018-02-07 16:42:16 -08:00

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