Jordan Rose 67f29eb470 Remove default from DeclAttributes::isUnavailableInSwiftVersion. (#8208) ...

If this had a default, it should be the effective language version,
not the compiler language version. That is, in the Swift 4 compiler's
Swift 3 mode, we want to be acting like Swift 3, not Swift 4.

2017-03-20 12:37:56 -07:00

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