RFR: 8372240: Convert FreeListAllocator to use Atomic<T>

[Kim Barrett]

On Fri, 21 Nov 2025 09:30:58 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Please review this change to FreeListAllocator to use Atomic rather than
>> directly applying AtomicAccess to volatile members.
>> 
>> Testing: mach5 tier1-5
>
> Marked as reviewed by tschatzl (Reviewer).

Thanks for reviews @tschatzl and @stefank

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PR Comment: https://git.openjdk.org/jdk/pull/28447#issuecomment-3568950913