RFR: 8370863: VectorAPI: Optimize the VectorMaskCast chain in specific patterns [v6]

[Eric Fang]

On Fri, 26 Dec 2025 11:10:07 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Eric Fang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Refine code comments
>
> I'll review this again in early January, once I'm back from Christnas/New Year break ;)

Hi @eme64 I have addressed your comments, thanks for your review ! And now could you help me run an internal test, thanks~

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PR Comment: https://git.openjdk.org/jdk/pull/28313#issuecomment-3956345853