RFR: 8367451: GenShen: Remove the option to compute age census during evacuation

[Paul Hohensee]

On Thu, 11 Sep 2025 22:16:15 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This experimental option has always defaulted to false. We are working on changes that will make it impractical to maintain this option. We also do not regularly test this configuration.

Marked as reviewed by phh (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27236#pullrequestreview-3217527778