Explanation: This change is required for open source Swift to compile using and support compiling against the SDKs in Xcode 16.
Radar (and possibly SR Issue): rdar://134207783
Scope: Building on Apple platforms.
Risk: None anticipated.
Testing: CI, building Swift locally.
Reviewed By: Doug Gregor (DougGregor), Allan Shortlidge (tshortli)
@swift-ci test
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Don't emit attr_availability_need_platform_version for a @backDeployed or @_originallyDefinedIn that have a single unrecognized platform name.
rdar://134207783