Bug 300850 – Fix -Wmissing-declarations warnings during JavaScriptCore module verification

• Status: RESOLVED
• Resolution: FIXED
• Component: JavaScriptCore

[David Kilzer (:ddkilzer)]

Fix -Wmissing-declarations warnings during JavaScriptCore module verification.

This happens because TrackedReferences.h is marked as a private header for JavaScriptCore.framework, but it doesn't export any methods.

```
In file included from WebKitBuild/JavaScriptCore.build/Release/JavaScriptCore.build/VerifyModule/JavaScriptCore/objective-c++/Test.mm:1:
In file included from WebKitBuild/JavaScriptCore.build/Release/JavaScriptCore.build/VerifyModule/JavaScriptCore/objective-c++/Test.framework/Headers/Test.h:792:
WebKitBuild/Release/JavaScriptCore.framework/PrivateHeaders/TrackedReferences.h:43:5: warning: declaration does not declare anything [-Wmissing-declarations]
   43 |     void check(JSCell*) const;
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~
WebKitBuild/Release/JavaScriptCore.framework/PrivateHeaders/TrackedReferences.h:44:5: warning: declaration does not declare anything [-Wmissing-declarations]
   44 |     void check(JSValue) const;
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~
```

[Radar WebKit Bug Importer]

<rdar://problem/162735197>

[David Kilzer (:ddkilzer)]

Pull request: https://github.com/WebKit/WebKit/pull/52436

[EWS]

Committed 301645@main (8e39b0b531eb): <https://commits.webkit.org/301645@main>

Reviewed commits have been landed. Closing PR #52436 and removing active labels.