RFR: 8290812: Add a test for ResourceHashtable [v8]

[Coleen Phillimore]

On Wed, 3 Aug 2022 13:37:55 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> I added a test for ResourceHashtable to show the interactions with it and Symbol* refcounting.
>> Tested with tier1 on Oracle platforms.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   More test cleanup

Thanks for your suggested improvements, Ioi!

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PR: https://git.openjdk.org/jdk/pull/9603