RFR: 8374350: Convert hotspot gtests to use Atomic<T> [v2]

[Kim Barrett]

On Fri, 2 Jan 2026 10:08:26 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Please review this change to convert HotSpot gtests to use Atomic<T> rather
>> than directly using AtomicAccess.
>> 
>> test_atomicAccess.cpp is, of course, not subject to this conversion.
>> 
>> test_globalCounter.cpp is also not included in this conversion.  The other
>> conversions were straight forward.  This test is less so, and I decided I
>> needed to spend more time studying it, so have left it for followup work.
>> 
>> The conversion of each test is a separate commit, in case that makes it easier
>> to review.
>> 
>> Testing: mach5 tier1
>
> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update copyrights

GHA linux-x64-debug build failed because out of disk space.

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PR Comment: https://git.openjdk.org/jdk/pull/29001#issuecomment-3706843863