RFR: 8365911: AArch64: Fix encoding error in sve_cpy for negative floats [v2]

[erifan]

On Wed, 3 Sep 2025 08:50:57 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> It's hard to say, because it is actually the value bits of a fp8.
>> 
>> Simply put, the lower 8 bits are valid values. The remaining bits must be 0.
>
> Sorry, thinko. I meant to say
> 
> `imm8 & ~0xff`
> 
> but never mind, let it stand.

Ok, thanks!

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PR Review Comment: https://git.openjdk.org/jdk/pull/26951#discussion_r2318451958