RFR: 8213269: convert test/hotspot/jtreg/runtime/memory/RunUnitTestsConcurrently to gtest [v10]

[Mikhailo Seledtsov]

On Mon, 8 Mar 2021 13:51:04 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Mikhailo Seledtsov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Using C_HEAP_ARRAY macros plus a minor fix
>
> Marked as reviewed by coleenp (Reviewer).

Thank you again Igor, Coleen, Thomas and Kim for review and discussion.

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