RFR: 8310031: Parallel: Implement better work distribution for large object arrays in old gen [v21]

[Richard Reingruber]

On Fri, 13 Oct 2023 14:48:23 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Should https://bugs.openjdk.org/browse/JDK-8309960 be reverted? Better in a follow-up I guess.
>
>> Should https://bugs.openjdk.org/browse/JDK-8309960 be reverted? Better in a follow-up I guess.
> 
> Better in its own PR, IMO.

Thanks to @albertnetymk the final version is a good deal simpler than the _baseline_. The extra effort was totally woth it.
In the end parallel processing of large arrays is like a side effect of the refactoring.

Thanks everybody for the review work and feedback!

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PR Comment: https://git.openjdk.org/jdk/pull/14846#issuecomment-1776641794