[jdk25u] RFR: 8368732: RISC-V: Detect support for misaligned vector access via hwprobe

[Fei Yang]

On Tue, 30 Sep 2025 04:46:01 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi,
> Please help review this backport to jdk25u, thanks!
> 
> Backport of [JDK-8368732](https://bugs.openjdk.org/browse/JDK-8368732).
> 
> The original patch cannot be directly applied because of jdk25u do not have [JDK-8367253](https://bugs.openjdk.org/browse/JDK-8367253) or [JDK-8367103](https://bugs.openjdk.org/browse/JDK-8367103).
> 
> Manually checked the result on platforms w/wo fast misaligned vector accesses by running:
> 
> $ java -XX:+PrintFlagsFinal -version | grep AlignVector

Looks good.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk25u/pull/252#pullrequestreview-3282979802