RFR: 8355971: Build warnings after the changes for JDK-8354996

[Chen Liang]

On Wed, 30 Apr 2025 17:32:34 GMT, Chen Liang <liach at openjdk.org> wrote:

> There were a few warnings related to illegal native access in HelloClasslist after adding some of the downcall infrastructure. Did a clean build and there were no warning associated with the 
> 
> Compiling up to 2 files for CLASSLIST_JAR
> Creating support/classlist.jar
> 
> steps.

Thank you for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/24970#issuecomment-2843058452