Jordan Rose 2c40c6bc21 [Serialization] Fix message for using an older compiler's module file (#17340) ...

Previously: "module compiled with Swift 4.1 cannot be imported in Swift
4.1.50" (i.e. following the -swift-version flag)

Now: "module compiled with Swift 4.1 cannot be imported by the Swift
4.2 compiler"

I'm pretty sure this is what I intended to do all along, and I just
messed it up when I originally implemented it. This is especially
important when working with downloadable toolchains, which would say
"module compiled with Swift 4.2 cannot be imported in Swift 4.1.50",
which is not really the problem at all. Now it'll fall back to the
more generic "module file was created by an older version of the
compiler" error.

2018-06-25 09:20:31 -07:00

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