[Migrator] Don't run AST passes when in Swift 4 or later #10543
Merged
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AST passes assume that you are migrating from a version earlier
than Swift 4, where declaration references and type names may be
unconditionally renamed if their USRs match.
For example, this can happen for TypeMemberDiffItem entries where the
Objective-C USR is the same in Swift 3 and Swift 4, but the type is
spelled differently in Swift 4. A concrete example of this is:
NSDocumentTypeDocumentAttribute
(Swift 3) ->NSAttributedString.DocumentAttributeKey
(Swift 4).Although this declaration is imported differently in Swift 4, its
Objective-C USR is
c:@NSDocumentTypeDocumentAttribute
for both.rdar://problem/32604558