swift234

Foundation overlay: add NSCoder.decodeObjectOfClasses(_:forKey:)

Due to the fact that AnyClass is not Hashable, and that currently
NSKeyedArchiver/Unarchiver work with NSObject-derived, NSCoding
compliant classes, we are marking the decodeObjectOfClasses API refined
for Swift in our objc header and providing the desired overlay in our
overlay as shown below.

Arrays were also considered (for both API), but the underlying
implementation is entirely set-based, and using Arrays in Swift vs Sets
in objective C felt like too far a deviation.

Patch by Michael LeHew Jr.

Changes to the Dictionary test are caused by bumping the Fonudation API
epoch and taking in a fix in the types used in an NSDictionary
initializer.

rdar://21486551

Swift SVN r30297