RFR: 8348829: Remove ObjectMonitor perf counters [v3]

[David Holmes]

On Tue, 18 Mar 2025 10:52:26 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> See bug for more discussion. I believe these counters are useless and come with more trouble than their worth.
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - Merge branch 'master' into JDK-8348829-remove-om-counters
>  - Merge branch 'master' into JDK-8348829-remove-om-counters
>  - Counters removal

Still good. Thanks

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23326#pullrequestreview-2700941632