RFR: 8378348: Obsolete ParallelRefProcEnabled

[Albert Mingkun Yang]

On Fri, 20 Feb 2026 13:05:01 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Obsolete `ParallelRefProcEnabled`, which has `true` as its default value, for GCs (Parallel and G1) supporting this flag.
> 
> Test: tier1-5

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/29845#issuecomment-3943911764