RFR: 8271242: Add Arena regression tests

[Thomas Stuefe]

On Tue, 27 Jul 2021 22:38:06 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

> Thank you for adding these tests. These new tests look good to me (from HotSpot test engineer POV). Someone who is an expert in Arena allocation should review this change as well.

Thank you Mikhailo!

> test/hotspot/jtreg/gtest/ArenaGtests.java line 38:
> 
>> 36:  * @modules java.base/jdk.internal.misc
>> 37:  *          java.xml
>> 38:  * @requires vm.flagless
> 
> Style comment: Please group all at-requires together in the same or neighboring lines.

Will do.

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PR: https://git.openjdk.java.net/jdk/pull/4909