Integrated: 8377200: Shenandoah: Convert shenandoahSharedVariables and related code to use Atomic<T>

[Ben Taylor]

On Sat, 7 Feb 2026 00:22:15 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Modernizes ShenandoahSharedVariables code by replacing AtomicAccess methods with Atomic<T> types.
>> 
>> Tier1 test results on x86_64 linux are the same before and after this change when running with TEST_VM_OPTS=-XX:+UseShenandoahGC.
>
> src/hotspot/share/gc/shenandoah/shenandoahSharedVariables.hpp line 186:
> 
>> 184:   }
>> 185: 
>> 186:   volatile ShenandoahSharedValue* addr_of() {
> 
> I take it nobody is using this?

Correct. There are no uses of this method, and after this change it would break encapsulation on the `Atomic`, so it seemed best to remove it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29594#discussion_r2784137925