Concurrency back deployment and swift-stdlib 5.0

Swift Concurrency can be used in applications with deployment target iOS 12 and above, and macOS applications targeted for Catalina and later.
If I understand correctly (looking at swift/stdlib/public/BackDeployConcurrency at main · apple/swift · GitHub), back deployment is limited to stdlib 5.1. Given that ABI stability was introduced in Swift 5.0, is it technically possible to extend support to iOS 12.2 (the first release to ship with Swift 5.0)? If it is, what kind of issues would need to be fixed for this to work?

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