RFR: 8376761: ARM32: Constant base assert after JDK-8373266

[Aleksey Shipilev]

On Mon, 2 Feb 2026 18:39:50 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Missed the obvious spot in [JDK-8373266](https://bugs.openjdk.org/browse/JDK-8373266). ARM32 uses this cached field for quick loads in CardTableBarrierSet barriers. This does not apply to Shenandoah and G1 barriers. So we only need to make sure card table is properly initialized to nullptr.
> 
> Additional testing:
>  - [x] Linux ARM32 build now passes `java HelloWorld.java`

Let's not spend too much time on this. If you want to change the style, then sure, we can do that as the followups. But this one is for unbreaking ARM32, and it stands to reason to follow the style of the original changeset.

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PR Comment: https://git.openjdk.org/jdk/pull/29528#issuecomment-3846143038