RFR: 8361426: (ref) Remove jdk.internal.ref.Cleaner

[Kim Barrett]

On Tue, 8 Jul 2025 04:59:04 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

>> Please review this change that removes the class jdk.internal.ref.Cleaner.
>> It is no longer used after JDK-8344332.
>> 
>> Testing: mach5 tier1-3
>
> This looks OK to me and matches with what was discussed about this in a recent PR https://github.com/openjdk/jdk/pull/25289#discussion_r2172727041. 
> 
> It would be good to get another review for this before integrating.

@jaikiran requested another reviewer, so

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PR Comment: https://git.openjdk.org/jdk/pull/26141#issuecomment-3048506399