RFR: 8367982: Unify ObjectSynchronizer and LightweightSynchronizer

[Fei Yang]

On Thu, 23 Oct 2025 08:38:05 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

> @bulasevich, @TheRealMDoerr, @RealFYang, @offamitkumar Hi guys! This is the last PR in a series of PRs to obsolete the `LockingMode` flag and related code. So please please grab a copy, run it on your favorite platform, and tell me if there's anything wrong with it. Thanks in advance.

Hello, A simple tier1 test is good on linux-riscv64. I checked the riscv part and I only see in indentation issues as pointed out by @TheRealMDoerr.

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PR Comment: https://git.openjdk.org/jdk/pull/27915#issuecomment-3440216009