RFR: 8341042: GenShen: Reset mark bitmaps for unaffiliated regions when preparing for a cycle

[Kelvin Nilsen]

On Thu, 26 Sep 2024 16:55:55 GMT, William Kemper <wkemper at openjdk.org> wrote:

> A recent change to reset unaffiliated bitmaps during the concurrent cleanup phase has caused a performance regression. Likely because concurrent cleanup only uses one thread (at this time). This issue is to revert the regression causing change while we work on a preferred solution.

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/504#pullrequestreview-2331922478