RFR: JDK-8328272: [AIX] Use flag kind "diagnostic" for platform specific flags

[Martin Doerr]

On Sat, 16 Mar 2024 13:53:13 GMT, Joachim Kern <jkern at openjdk.org> wrote:

> Current platform implementation (globals_aix.hpp) uses regular product flags for almost everything.
> Most platform specific flags were never intended for official support. They are only there to diagnose issues and find workarounds.
> So flag kind "diagnostic" fits better for them.

LGTM.

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Marked as reviewed by mdoerr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18337#pullrequestreview-1942625904