RFR: 8321648: Integral gather optimized mask computation.

[Quan Anh Mai]

On Mon, 11 Dec 2023 07:26:31 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> Hi,
> 
> This bug fix patch optimizes integral gather mask computation using cheaper instruction and fixes incorrect instruction attributes in legacy integral gather instructions.
> 
> All Vector API JTREG tests are passing with this at various AVX levels.
> 
> Kindly review and share feedback.
> 
> Best Regards,
> Jatin

While you are at it, you can change the `address` operand of these to only accept no-index ones, removing the need of the `lea` instruction.

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PR Comment: https://git.openjdk.org/jdk/pull/17048#issuecomment-1849579917