[6.0][Concurrency] Fix disallowed override isolation to carry `@preconcurr… #75112
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…ency` bit
Fixes a source compatibility regression in
complete
checking mode.If ObjC member cannot be overridden due to isolation mismatch set
@preconcurrency
bit to make the diagnostic a warning instead of an error in Swift 5 mode.Main Branch PR: [Concurrency] Fix disallowed override isolation to carry `@preconcurr… #75087
Resolves: rdar://130776220
Risk: Low
Reviewed By: @hborla
Testing: New tests were added to the suite.
(cherry picked from commit f7d3230)