stdlib: in Array bridging code, use the same pattern as Set and Dictionary use
stdlib: in Array bridging code, use the same pattern as Set and Dictionary use

Also, simplify the code by removing an unused parameter.  NFC.

Swift SVN r28607

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