RFR: 8328932: Parallel: Proper partial object setup in fill_dense_prefix_end [v2]

[Guoxiong Li]

On Tue, 2 Apr 2024 08:25:13 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Oneline diff  to maintain the partial-obj invariant, just like `MarkingStatsCache::push`.
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
> 
>   pgc-filler-partial-obj

LGTM.

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Marked as reviewed by gli (Committer).

PR Review: https://git.openjdk.org/jdk/pull/18469#pullrequestreview-1976301194