[5.1] cherry-pick swift-api-digester fixes and regenerated ABI/API baselines #23740
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… table entry as ABI breakage Protocol requirements may not necessarily add new entries to the witness table if it's inherited from super protocol. This patch teaches the json dump to include a flag indicating whether a protocol requirement requires new witness table entry and diagnoses the change of such flag as ABI breakages. rdar://47657204
…rmance is ABI placeholder. ABI placeholders are decls with attribute '@available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *)'. The diagnostics phase could be forgiving for ABI breakages on these decls since they are added recently. This patch adds a new flag to the json file indicating whether a declaration or a conformance is an ABI placeholder. The checking of placeholder is transitive, meaning a decl is an ABI placeholder if its decl context is one. rdar://49502365
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@swift-ci please test |
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