[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

tools/lldb-moduleimport-test/lldb-moduleimport-test.cpp

@@ -48,6 +48,8 @@ static void printValidationInfo(llvm::StringRef data) {
   if (info.status != swift::serialization::Status::Valid)
     return;
 
+  if (!info.shortVersion.empty())
+    llvm::outs() << "- Swift Version: " << info.shortVersion << "\n";
   llvm::outs() << "- Target: " << info.targetTriple << "\n";
   if (!extendedInfo.getSDKPath().empty())
     llvm::outs() << "- SDK path: " << extendedInfo.getSDKPath() << "\n";