Integrated: 8364570: Remove LockingMode related code from riscv64

[Fredrik Bredberg]

On Wed, 6 Aug 2025 11:24:22 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 **riscv64** 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: e77cdd93
Author:    Fredrik Bredberg <fbredberg at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/e77cdd93ead5601fea4bb1bf1847835e1097b851
Stats:     584 lines in 9 files changed: 7 ins; 528 del; 49 mod

8364570: Remove LockingMode related code from riscv64

Reviewed-by: fyang, fjiang

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PR: https://git.openjdk.org/jdk/pull/26658