RFR: 8213269: convert test/hotspot/jtreg/runtime/memory/RunUnitTestsConcurrently to gtest [v6]

Wed Mar 3 19:05:40 UTC 2021

On Wed, 3 Mar 2021 18:23:59 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

>> apparently, I had a false memory, we indeed have more `camelCase` than `small_snake_case` files, so @mseledts, you will need to revert that. sorry for wasting your time. in my defense, most of the files are just `case` hence can be interpreted either way :)
>
> No worries. I will 'git rename' it back to the original name, I hope this will work.

See also "Naming and Grouping" here: https://github.com/openjdk/jdk/blob/master/doc/hotspot-unit-tests.md

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