Jordan Rose 8f820dea2b [serialization] Diagnose loading modules from older Swifts. ...

...with a better message than the generic "older version of the
compiler" one, when we know it's actually a different version of
Swift proper.

This still uses the same internal module version numbers to check
if the module is compatible; the presentation of language versions
is a diagnostic thing only.

Speaking of module version numbers, this deliberately does NOT
increment VERSION_MINOR; it's implemented in a backwards-compatible
way.

This will only work going forwards, of course; all existing modules
don't have a short version string, and I don't feel comfortable
assuming all older modules we might encounter are "Swift 2.2".

rdar://problem/25680392

2016-04-29 16:25:33 -07:00

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