RFR: 8374694: ZGC: Convert zRootsIterator to use Atomic<T>

[Stefan Karlsson]

On Fri, 16 Jan 2026 09:07:59 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> Convert usages of AtomicAccess to Atomic<T> in zRootsIterator.
> 
> Testing:
>  * GHA
>  * HotSpot GC tests with ZGC linux x64 and linux aarch64

src/hotspot/share/gc/z/zRootsIterator.hpp line 38:

> 36: private:
> 37:   Iterator      _iter;
> 38:   Atomic<bool>  _completed;

Could you remove one space from all member indentations here?

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PR Review Comment: https://git.openjdk.org/jdk/pull/29270#discussion_r2697680474