RFR: 8354078: Implement JEP 521: Generational Shenandoah [v2]

[Y. Srinivas Ramakrishna]

On Mon, 19 May 2025 17:30:35 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Testing:
>> 
>> % ./build/linux-x86_64-server-fastdebug/jdk/bin/java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational --version
>> openjdk 25 2025-09-16
>> OpenJDK Runtime Environment (fastdebug build 25-make-genshen-non-experimental)
>> OpenJDK 64-Bit Server VM (fastdebug build 25-make-genshen-non-experimental, mixed mode)
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update test asserting that generational mode is experimental

Looks good, thanks!

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Marked as reviewed by ysr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25270#pullrequestreview-2852164466