RFR: 8321214: Parallel: Remove unused SpaceInfo::_min_dense_prefix

[Zhengyu Gu]

On Sun, 3 Dec 2023 21:38:12 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> A trivial cleanup that removed unused `_min_dense_prefix` member from `SpaceInfo`.
>
> Looks good, and trivial.  Another permgen cleanup!

Thanks, @kimbarrett and @tschatzl

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PR Comment: https://git.openjdk.org/jdk/pull/16932#issuecomment-1838709630