RFR: 8361056: Parallel: Use correct is_par argument in ScavengeRootsTask

[Albert Mingkun Yang]

On Mon, 30 Jun 2025 08:37:49 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial fixing the hardcoded `is_par` arg used during young-gc.

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/26039#issuecomment-3023168330