Jordan Rose 8a9495a3d1 [ClangImporter] Honor Swift 4 API notes in Swift 3 mode ...

*** Depends on Clang change "[APINotes] Record what version caused ***
*** an annotation to get replaced." Update your Clang checkout!    ***

More generally, change the meaning of the SwiftVersions section in API
notes to be "this version or earlier" rather than "exactly this
version". We mostly get this behavior for free from the Clang-side
changes, but for SwiftName and the enum annotations we look at inactive
attributes as well. The latter is simple, but the former means being
careful about finding the annotation we /would/ have picked, i.e. the
one closest to the version we requested.

2017-09-15 14:30:24 -07:00

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