Integrated: 8365146: Remove LockingMode related code from ppc64

[Fredrik Bredberg]

On Fri, 8 Aug 2025 12:53:10 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.

This pull request has now been integrated.

Changeset: a7c0f4b8
Author:    Fredrik Bredberg <fbredberg at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/a7c0f4b845c314099966f5669bfc7947bdf28004
Stats:     632 lines in 8 files changed: 1 ins; 579 del; 52 mod

8365146: Remove LockingMode related code from ppc64

Reviewed-by: aboldtch, mdoerr

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PR: https://git.openjdk.org/jdk/pull/26697