RFR: 8348561: Add aarch64 intrinsics for ML-DSA [v6]

[Andrew Dinn]

On Thu, 20 Feb 2025 17:33:18 GMT, Ferenc Rakoczi <duke at openjdk.org> wrote:

>> By using the aarch64 vector registers the speed of the computation of the ML-DSA algorithms (key generation, document signing, signature verification) can be approximately doubled.
>
> Ferenc Rakoczi has updated the pull request incrementally with four additional commits since the last revision:
> 
>  - Accepting suggested change from Andrew Dinn
>  - Added comments suggested by Andrew Dinn
>  - Fixed copyright years
>  - renaming a couple of functions

I raised [JDK-8350589](https://bugs.openjdk.org/browse/JDK-8350589) to cover investigation of an alternative implementation.

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PR Comment: https://git.openjdk.org/jdk/pull/23300#issuecomment-2679012108