Jordan Rose cb9b9ea734 [ClangImporter] Always import types under their Swift 4 name. ...

This means all cross-module references and all mangled names will
consistently use the Swift 4 name (the canonical type), no special
handling required.

The main thing we lose here is that the Swift 4 names of imported
types become usable in Swift 3 mode without any diagnostics, similar
to how most language features introduced in Swift 4 are available in
Swift 3 mode. It also implies that the Swift 4 name will show up in
demangled names.

rdar://problem/31616162

2017-04-26 13:07:03 -07:00

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