RFR: 8367014: Rename class Atomic to AtomicAccess

[Kim Barrett]

On Mon, 8 Sep 2025 09:32:43 GMT, Andrew Haley <aph at openjdk.org> wrote:

> `AtomicAccess` is a bit wordy, and this change is going to mess up diffs for backports terribly, but I can't think of a better way to do it. Thanks.

There was a bunch of internal to Oracle bike shedding over the names already. But I'm open to more if someone
thinks they have a better idea. Note that once we're all done with switching to `Atomic<T>` where appropriate,
I don't expect very many direct uses of `AtomicAccess` to remain (though there will be _some_).

Diffs for backports are going to get messed up anyway, since most uses of `AtomicAccess` will eventually be
switched over to `Atomic<T>` style usage.

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PR Comment: https://git.openjdk.org/jdk/pull/27135#issuecomment-3265464120