Ted Kremenek cc3024d7c5 Swift 4.x (x < 2) names are obsoleted in 4.2, not 5. ...

In APINotes, when an unversioned name overrides
a previously declared name with a Swift version, if the
previously declared name is guarded under version 4
the obsoleted version should be 4.2, not 5.  In all other
cases, the obsoleted version is the next major Swift
version.

Fixes rdar://problem/39950937

2018-05-09 00:19:42 -07:00

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