RFR: 8296970: Remove sysThreadAvailableStackWithSlack from hotspot-symbols

[Man Cao]

On Tue, 15 Nov 2022 05:29:48 GMT, Man Cao <manc at openjdk.org> wrote:

> Hi all,
> 
> Could anyone review this cleanup to remove dead symbol "sysThreadAvailableStackWithSlack"? See https://bugs.openjdk.org/browse/JDK-8296970 for more details.
> 
> -Man

Thank you for the reviews!

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PR: https://git.openjdk.org/jdk/pull/11156