RFR: 8307295: Add warning to not create new ACC flags [v2]

[Frederic Parain]

On Wed, 3 May 2023 19:20:34 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please comment on or review this new comment.  Thanks.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update with suggestion from John.

LGTM

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Marked as reviewed by fparain (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13757#pullrequestreview-1413041175