RFR: 8350483: AArch64: turn on signum intrinsics by default on Ampere CPUs

[Patrick Zhang]

On Tue, 25 Feb 2025 14:23:43 GMT, Andrew Haley <aph at openjdk.org> wrote:

> 
> Here's one: [JDK-8350663](https://bugs.openjdk.org/browse/JDK-8350663) Are you interested in picking it up?

Sure, I will take it. BTW, could you please help sponsor this commit, thanks.

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PR Comment: https://git.openjdk.org/jdk/pull/23735#issuecomment-2683777970