RFR: 8373208: Make Atomic class template constant initializable [v2]

[Stefan Karlsson]

On Mon, 15 Dec 2025 01:39:44 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Please review this change to Atomic to meet the requirements for constant
>> initialization in cases where the value type provides the requisite support.
>> This ensures that in such cases dynamic initialization won't even be
>> considered a possibility when initialized with constant arguments.
>> 
>> Testing: mach5 tier1
>
> Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
> 
>  - Merge branch 'master' into constinit-atomic
>  - constexpr Atomc ctors

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28711#pullrequestreview-3576982345