Stephen Canon dc5915cdb5 Replace stdlib and test/stdlib 9999 availability. (#26108) ...

* Replace stdlib and test/stdlib 9999 availability.

macOS 9999 -> macOS 10.15
iOS 9999 -> iOS 13
tvOS 9999 -> tvOS 13
watchOS 9999 -> watchOS 6

* Restore the pre-10.15 version of public init?(_: NSRange, in: __shared String)

We need this to allow master to work on 10.14 systems (in particular, to allow PR testing to work correctly without disabling back-deployment tests).

2019-07-12 16:30:36 -04:00

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