[5.3][SourceKit] Report macCatalyst availability as macCatalyst rather than iOS #31536
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Cherry-pick of #31466 for 5.3.
Explanation:
SourceKit's doc-info request was incorrectly reporting the platform of
@available(macCatalyst, ...)
attributes assource.availability.platform.ios
rather thansource.availability.platform.maccatalyst
.Scope of issue: Only impacts sourcekitd's doc-info request. Other sourcekitd requests and the compiler are unaffected.
Origination: Has been an issue since explicit macCatalyst availability attribute support was added.
Risk: Low. It's a single line change and only impacts SourceKit's doc-info request.
Testing: Added a regression test for this case and all existing tests pass.
Reviewer: Rintaro Ishizaki (@rintaro) on the master branch PR
Resolves rdar://problem/60918688