RFR: 8367717: Cleanup atomic_copy64 [v2]

[Justin King]

On Mon, 6 Oct 2025 09:38:24 GMT, jonghoonpark <duke at openjdk.org> wrote:

>> related jira issue: https://bugs.openjdk.org/browse/JDK-8367717
>> 
>> ## Changes
>> - deleted all definitions of atomic_copy64
>> - replaced all calls to `atomic_copy64` with `AtomicAccess::store(dst, AtomicAccess::load(src))`
>> 
>> ## Verification
>> - Verified by running:
>>   - `make run-test TEST="gtest:StubRoutines*"`
>>   - `make run-test TEST="gtest:AtomicAccess*"`
>> 
>> Please let me know if there are any additional or more appropriate verification steps I should perform.
>
> jonghoonpark has updated the pull request incrementally with one additional commit since the last revision:
> 
>   cleanup: align to use AtomicAccess
>   
>   Signed-off-by: jonghoonpark <dev at jonghoonpark.com>

This partially fixes https://bugs.openjdk.org/browse/JDK-8369207 as well, but this only does it for `jlong`.  I can wait for this to go in, and then update `jshort` and `jint` to use `AtomicAccess` as well or we can do it all in this PR.

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PR Comment: https://git.openjdk.org/jdk/pull/27642#issuecomment-3371948431