Doug Gregor c68ef1cf71 Add an optional language feature for Library Evolution ...

Replace the one-off compiler flag for Library Evolution with an
optional language feature. This makes the
`hasFeature(LibraryEvolution)` check work in an `#if`, and is
otherwise just cleanup.

Tracked by rdar://161125572.

2025-09-22 17:45:34 -07:00

3.4 KiB

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