RFR: 8372978: [VectorAPI] Fix incorrect identity values in UMIN/UMAX reductions [v3]

[Eric Fang]

On Fri, 19 Dec 2025 22:02:03 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> Hi @PaulSandoz . I've changed to using a temporary variable.
>> 
>> By the way, are you worried that the `read-after-write` optimization isn't implemented in some architectures?
>
> Or for some reason does not happen. I find it best if for the hot loops we can keep the code as focused as possible.

Got it, thanks~

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PR Review Comment: https://git.openjdk.org/jdk/pull/28692#discussion_r2642240929