RFR: 8354347: Increase the default padding size for aarch64 in JDK code.

[Andrew Haley]

On Fri, 2 May 2025 00:49:45 GMT, Peter B. Kessler <pbk at openjdk.org> wrote:

> Increase the default padding for C++ fields to avoid false sharing.

Thanks.

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Marked as reviewed by aph (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24994#pullrequestreview-2811475908