Extend "uses concurrency features" checks for closures currently being type checked #40544
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When type-checking a closure, use the type that it will have in context (e.g., considering inferred
@Sendable
andasync
) to determine whether that closure should perform strict checking. This allows us to better detect when we should diagnose data races in Swift 5.x code.Fixes SR-15131 / rdar:https://problem/82535088.