RFR: 8338428: Add logging if final VM flags while setting properties [v6]

[Leonid Mesnik]

On Fri, 17 Jan 2025 18:50:22 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> Some VM flags might depend on the environment and it makes sense to log final flags so it is possible to get their value when investigating failures.
>> 
>> I added them to VMProps, so it is always dump final flags before running tests using "-XX:+PrintFlagsFinal".
>> 
>> Update:
>> There were intermittent compilation failures when I tried to use classes from testlibrary, so I rewrtite the code without them.
>
> Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   updated flags

This flag is not used while tests are executed. It is used only when jtreg run VMProps, executed before all tests are run and you can find result in scratch directory.

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PR Comment: https://git.openjdk.org/jdk/pull/23054#issuecomment-2599422465