RFR: 8369983: Remove expired ZGC flags for JDK 26

Wed Oct 29 10:01:24 UTC 2025

On Thu, 16 Oct 2025 12:20:33 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Hello,
>> 
>> The ZGenerational flag was obsoleted in JDK 24 as part of removing the non-generational mode of ZGC in JEP 490. The flag was still obsolete in JDK 25, which is a LTS version, so that user's that might specify/try to use it are prompted with a warning. Now that we're past JDK 25, the flag should be expired. Likewise, the ZMarkStackSpaceLimit flag was obsoleted in JDK 25 and can now be expired in JDK 26.
>> 
>> Since neither of these flags were documented in `java.md` I haven't added them to the "Removed Java Options" section in that file.
>
> Marked as reviewed by ayang (Reviewer).

Thank you for the reviews! @albertnetymk @xmas92

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PR Comment: https://git.openjdk.org/jdk/pull/27838#issuecomment-3460667531