Jordan Rose 73b7185a3d [ModuleInterfaces] Warn emitting an interface in -swift-version 4[.2] ...

If the project ever drops Swift 4 mode or Swift 4.2 mode, that would
break modules using those modes in their interface, so put an
unsilenceable warning in for using those modes to nudge interface
emitters to Swift 5.

rdar://problem/47792595

2019-05-01 17:32:12 -07:00

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