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

[Kim Barrett]

On Sat, 2 Dec 2023 13:34:07 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> A trivial cleanup that removed unused `_min_dense_prefix` member from `SpaceInfo`.

Looks good, and trivial.  Another permgen cleanup!

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16932#pullrequestreview-1761371571