[region-isolation] Reword merge-region diagnostics so we never fail on missing names#89270

gottesmm merged 1 commit into

swiftlang:mainswiftlang/swift:mainfrom

gottesmm:pr-a4bb80740cb2c23d59d4ca24e8ff2565468c2737gottesmm/swift:pr-a4bb80740cb2c23d59d4ca24e8ff2565468c2737Copy head branch name to clipboard