RFR: 8367013: Add Atomic<T> to package/replace idiom of volatile var plus AtomicAccess:: operations [v7]

[Kim Barrett]

On Wed, 12 Nov 2025 06:27:59 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> Looks good.
> 
> The gtest still uses a mix of the x86 instruction and the new `compare_exchange` / `exchange` nomenclature. Feel free to unify this, or leave it as is (can always fix this later).

I'm going to leave that for later, so I don't need to get y'all to re-review.

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PR Comment: https://git.openjdk.org/jdk/pull/27539#issuecomment-3526437172