RFR: 8367486: Change prefix for platform-dependent AtomicAccess files [v3]

[Kim Barrett]

On Mon, 15 Sep 2025 06:14:49 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Or maybe the definition of `atomic_copy64` for linux-zero should be moved to `os_linux_zero.cpp`, which
>> I think would be consistent with all of the other definitions/uses of that function.
>
> I've updated the file to use atomicAccess.hpp, but I'll let someone else make the move of the function if that is deemed to be the right thing to do.

https://bugs.openjdk.org/browse/JDK-8367717 "Cleanup atomic_copy64"

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PR Review Comment: https://git.openjdk.org/jdk/pull/27245#discussion_r2350335610