Sink Swift's adapter for NSZone into the ObjectiveC overlay.
Sink Swift's adapter for NSZone into the ObjectiveC overlay.

While Foundation actually defines the NSZone typedef and what you can do with
it, the ObjectiveC module makes use of it in its raw form: "struct _NSZone *".
To avoid a circular dependency, sink our adapter down to the ObjectiveC
overlay.

Swift SVN r21827

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation