[5.9] Sema: Relax @backDeployed availability conflict diagnostics.
#64751
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Only diagnose `@backDeployed` as conflicting with unavailability if the attribute that is making the declaration unavailable is unconditional or it is for the same base platform. For example, it should be allowed to back deploy a function on macOS while making that function unavailable for application extensions on macOS. Resolves rdar://107291474
tshortli
added
🍒 release cherry pick
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@swift-ci please test |
nkcsgexi
approved these changes
Mar 29, 2023
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Cherry-pick of #64750.
Only diagnose
@backDeployedas conflicting with unavailability if the attribute that is making the declaration unavailable is unconditional or it is for the same base platform. For example, it should be allowed to back deploy a function on macOS while making that function unavailable for application extensions on macOS.Resolves rdar://107291474