RFR: JDK-8303815: Improve Metaspace test speed

[Thomas Stuefe]

On Wed, 23 Aug 2023 08:56:15 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Small adjustments that cut down time needed for Metaspace tests:
>> 
>> gtests: 22 seconds -> 6 seconds
>> elastic metaspace jtreg tests: 36 seconds -> 15 seconds
>> 
>> For the jtreg tests, I preserve the option to execute them full time as manual tests
>
> Marked as reviewed by stefank (Reviewer).

Thanks @stefank and @dholmes-ora

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PR Comment: https://git.openjdk.org/jdk/pull/15324#issuecomment-1691033823