Commits on Dec 19, 2016

1. Always desugar the base type of an extension when serializing. …

   This "fixes" two issues:
   
   - The name of a non-public typealias would leak into the public
     interface if the extension had any public members.
   
   - A common pattern of defining a platform-specific typealias for an
     imported class and then extending that type would lead to
     circularity when trying to deserialize the typealias. We /shouldn't/
     be loading the extension at that point, but fixing that would be
     much harder.
   
   The "right" answer is to (a) check that the typealias is public if the
   extension has any public members, and (b) somehow ensure there is no
   circularity issue (either by not importing the extension as a result
   of importing the typealias, or by the extension being able to set its
   sugared base type later).
   
   rdar://problem/29694978

   

   jrose-apple committed Dec 19, 2016
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