RFR: 8360220: Deprecate and obsolete ParallelRefProcBalancingEnabled

[Albert Mingkun Yang]

On Mon, 23 Jun 2025 09:14:43 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Deprecating `ParallelRefProcBalancingEnabled`, which is used only by Parallel and G1, and both have it enabled by default.
> 
> Disabling it offers little benefit, so removing it do reduce the number commandline flags.

Thanks for review.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/25932#issuecomment-2999161923