RFR: 8370666: VectorAPI: Add clear comments for vector relative code in c2 [v3]

[Xiaohong Gong]

On Tue, 13 Jan 2026 08:46:25 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Yes, correct.
>
> Do you mean I'd better comment these names as well? If so, I will refine the comment with next commit. Thanks!

Refined the comments. Thanks!

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PR Review Comment: https://git.openjdk.org/jdk/pull/29130#discussion_r2689108679