RFR: JDK-8325255 jdk.internal.util.ReferencedKeySet::add using wrong test [v4]

[ExE Boss]

On Tue, 5 Mar 2024 20:23:56 GMT, Jim Laskey <jlaskey at openjdk.org> wrote:

>> Currently, add is returning intern(e) == null which will always be false. The correct test is intern(e) == e , that is, true when element is newly added.
>
> Jim Laskey has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix ReferencedKeySet::add

Should this be backported to **JDK 22**, as that was when `jdk.internal.util.ReferencedKeySet` was introduced?

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PR Comment: https://git.openjdk.org/jdk/pull/17732#issuecomment-1986789023