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blocks:

• SR-377 Implement NSKeyed[Un]Archiver

Issue Description:

NSDictionary.init(objects: [AnyObject], forKeys keys: [NSObject]) crashes because keyBuffer/valueBuffer are uninitialised and the Swift runtime attempts to release the uninitialised memory before assignment:

    public convenience init(objects: [AnyObject], forKeys keys: [NSObject]) {
        let keyBuffer = UnsafeMutablePointer<NSObject>.alloc(keys.count)
        for idx in 0..<keys.count {
            keyBuffer[idx] = keys[idx]
        }
...

I can workaround it by adding the following immediately after initialisation:

bzero(unsafeBitCast(keyBuffer, UnsafeMutablePointer<Void>.self), keys.count * sizeof(NSObject))

But this doesn't strike me as the most idiomatically Swift way to do this. Suggestions on a better fix would be welcome.