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

[Matthias Baesken]

On Tue, 12 Aug 2025 13:12:33 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

>> Since the integration of [JDK-8359437](https://bugs.openjdk.org/browse/JDK-8359437) the `LockingMode` flag can no longer be set by the user, instead it's declared as `const int LockingMode = LM_LIGHTWEIGHT;`. This means that we can now safely remove all `LockingMode` related code from all platforms.
>> 
>> This PR removes `LockingMode` related code from the **ppc64** platform.
>> 
>> When all the `LockingMode` code has been removed from all platforms, we can go on and remove it from shared (non-platform specific) files as well. And finally remove the `LockingMode` variable itself.
>
> 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

AIX tests are fine too.

> Anyhow, thanks for testing out the patch. Now I only need someone to review it as well.

I think Martin  @TheRealMDoerr will be back next week, he will probably look into it.

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PR Comment: https://git.openjdk.org/jdk/pull/26697#issuecomment-3190826147