RFR: 8327022: Parallel: Remove experimental dense prefix calculation

[Aleksey Shipilev]

On Thu, 29 Feb 2024 10:06:02 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this trivial change to remove some experimental dense prefix calculation which has only been included in non-product builds and which results were always (regardless of build) thrown away.
> 
> Testing: gha, local compilation
> 
> Thanks,
>   Thomas

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18057#pullrequestreview-1908493150