RFR: 8367478: Improve UseAVX setting and add cpu descriptions for zhaoxin processors [v3]

[Jie Fu]

On Mon, 5 Jan 2026 10:34:05 GMT, Vic Wang <duke at openjdk.org> wrote:

> We have tested this change using benchmarks such as SPECjvm and SPECpower. While there is no obvious performance improvement (the gain is within ~0.5%), there is also no performance degradation.

I'm still not sure if there would be performance drop since SPECjvm and SPECpower can't cover all the cases.
Let's see what others think of it.
Thanks.

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PR Comment: https://git.openjdk.org/jdk/pull/27241#issuecomment-3709979048