RFR: 8162: Update OptionsCheckRule to JDK21 [v4]

[Alex Macdonald]

On Mon, 22 Jan 2024 19:33:52 GMT, Henrik Dafgård <hdafgard at openjdk.org> wrote:

>> Brings the OptionsCheckRule up to date with the state of JVM flags as of JDK 21.
>
> Henrik Dafgård has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 24 commits:
> 
>  - Merge branch 'master' into JMC-8162
>  - Merge remote-tracking branch 'upstream/master'
>  - Merge remote-tracking branch 'upstream/master'
>  - Merge remote-tracking branch 'upstream/master'
>  - Merge remote-tracking branch 'upstream/master'
>  - Merge remote-tracking branch 'upstream/master'
>  - Merge remote-tracking branch 'upstream/master'
>  - Merge remote-tracking branch 'upstream/master'
>  - Merge remote-tracking branch 'upstream/master'
>  - Merge remote-tracking branch 'upstream/master'
>  - ... and 14 more: https://git.openjdk.org/jmc/compare/793e8263...b0895fc2

The latest merge commit that handles the conflicts looks good to me.

Not sure what happened with all the other merge commits that were added though .. since Skara squashes everything down anyways this should still be okay to go.

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Marked as reviewed by aptmac (Reviewer).

PR Review: https://git.openjdk.org/jmc/pull/542#pullrequestreview-1839379077