RFR: 8360934: Add AVX-512 intrinsics for ML-KEM - enhancement on AVX512_VBMI [v5]

[Jatin Bhateja]

On Sun, 11 Jan 2026 06:59:20 GMT, Shawn M Emery <duke at openjdk.org> wrote:

>> This change allows use of the AVX512_VBMI instruction set to further optimize decompression/parsing of polynomial coefficients for ML-KEM.  The speedup gained in the ML-KEM benchmarks for key generation is between 0.4 to 0.5%, encapsulation is  0.2 to 1.7%, and decapsulation is 0.3 to 2.0%.
>> 
>> Thank you to @sviswa7 and @ferakocz for their help in working through the early stages of this code with me.
>
> Shawn M Emery has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update to use OptoLoopAlignment for VBMILoop

Marked as reviewed by jbhateja (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28815#pullrequestreview-3673509627