RFR: 8213269: convert test/hotspot/jtreg/runtime/memory/RunUnitTestsConcurrently to gtest [v9]

[Thomas Stuefe]

On Fri, 26 Feb 2021 00:42:46 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

>> Mikhailo Seledtsov has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Adding os_ prefix to concurrent virtual space tests
>>  - Using os:malloc instead of std::vector
>
> test/hotspot/gtest/concurrentTestRunner.inline.hpp line 100:
> 
>> 98: };
>> 99: 
>> 100: #endif // include guard
> 
> we tend to use the expression used in the corresponding `#if` / `#ifdef` as a comment in `#endif`

"include guard" is self evident. We usually write the name of it, like this:
#endif // GTEST_CONCURRENT_TEST_RUNNER_INLINE_HPP

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