RFR: 8213269: convert test/hotspot/jtreg/runtime/memory/RunUnitTestsConcurrently to gtest [v3]

[Mikhailo Seledtsov]

On Fri, 26 Feb 2021 00:48:29 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

>> Mikhailo Seledtsov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixed memory leak
>
> Changes requested by iignatyev (Reviewer).

I believe I have addressed the 2nd round of review feedback. @iignatev Igor, could you please take a look when you have a chance?

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PR: https://git.openjdk.java.net/jdk/pull/2436