RFR: 8325725: Parallel: Refactor PSParallelCompact::fill_dense_prefix_end [v3]

[Thomas Schatzl]

On Thu, 29 Feb 2024 11:58:20 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Refactor the logic around creating filler obj before prefix-end.
>> 
>> Test: tier1-6
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - review
>  - Merge branch 'master' into pgc-end-bit
>  - pgc-end-bit

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17822#pullrequestreview-1914070779