Fixed "Expression to complex" build failures.
Fixed "Expression to complex" build failures.

Fixed multiple occurrences of "Expression was too complex to be solved in reasonable time; consider breaking up the expression into distinct sub-expressions" errors which the Xcode 9 (9A235) tool chain generates while trying to compile the unit tests on a 2013 MacBook Pro.

johnno1962b/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,e78l/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,alblue/swift-corelibs-foundation,alblue/swift-corelibs-foundation,alblue/swift-corelibs-foundation,parkera/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,apple/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,apple/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,e78l/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,parkera/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,apple/swift-corelibs-foundation,parkera/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,alblue/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,parkera/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,alblue/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,e78l/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,parkera/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,e78l/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,apple/swift-corelibs-foundation