[5.3] Fix layering of cross-import and clang overlays #31222
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If a clang module declares a cross-import overlay, but it also has a traditional overlay, we want the cross-import overlay to be registered with the SourceFile as sitting atop the traditional overlay. Otherwise module-qualified name lookups will bypass the cross-import overlay. Fixes rdar://62139656.
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@swift-ci please test macOS platform |
AnthonyLatsis
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swift 5.3
🍒 release cherry pick
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Cherry-picks #31199 to release/5.3 branch: