RFR: 8365146: Remove LockingMode related code from ppc64 [v2]

[Fredrik Bredberg]

On Tue, 19 Aug 2025 10:13:01 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Fredrik Bredberg has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
>> 
>>  - Merge branch 'master' into 8365146_remove_lockingmode_ppc64
>>  - 8365146: Remove LockingMode related code from ppc64
>
> This looks good besides the missing .hpp file update.
> Not sure what the plan regarding [JDK-8336325](https://bugs.openjdk.org/browse/JDK-8336325) is and if some of the removed code will be needed again.

@TheRealMDoerr 
> This looks good besides the missing .hpp file update. Not sure what the plan regarding [JDK-8336325](https://bugs.openjdk.org/browse/JDK-8336325) is and if some of the removed code will be needed again.

The `UseHeavyMonitors` code was somewhat mixed up with the legacy locking code. So the current plan is that if we decide to add something that will force a slow path (as a develop or maybe diagnostic option), we’d do a clean addition.

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PR Comment: https://git.openjdk.org/jdk/pull/26697#issuecomment-3205011045