Jordan Rose c9124d989d [ClangImporter] Import Swift 3 versions of top-level decls in Swift 4. ...

...and Swift 4 versions in Swift 3, and Swift 2 and "raw" versions in
both. This allows the compiler to produce sensible errors and fix-its
when someone uses the "wrong" name for an API. The diagnostics
certainly have room to improve, but at least the essentials are there.

Note that this commit only addresses /top-level/ decls, i.e. those
found by lookup into a module. We're still limited to producing all
members of a nominal type up front, so that'll require a slightly
different approach.

Part of rdar://problem/29170671

2017-02-24 14:01:10 -08:00

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