Add availability gating for async function and actor type definitions. #38524
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Jul 21, 2021
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Explanation: Require actors and
asyncfunctions to have an availability of macOS 12.0/iOS 15.0/etc. This was already a requirement, but would only fail at link or load time. This escalates it to a semantic check to make it more obvious.Scope: Affects new code using the Swift Concurrency model.
Radar/SR Issue: rdar://80098709
Risk: Low.
Testing: PR testing and CI on main.
Original PR: #38510
Related LLDB PR: swiftlang/llvm-project#3116 (test-only update)