RFR: 8327652: S390x: Implements SLP support [v11]

[Amit Kumar]

On Mon, 23 Sep 2024 04:40:18 GMT, Sidraya Jayagond <sjayagond at openjdk.org> wrote:

>> This PR Adds SIMD support on s390x.
>
> Sidraya Jayagond has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix whitespace errors

@sid8606 Can you disable vector optimisation in string_compress, string_inflate, and string_inflate_const? Also, please address some of the suggestions that haven't been taken care of yet.

I got minimal working solution for preserving the vector registers here: https://github.com/offamitkumar/jdk/commit/71929af968533d96e126724ac1aa3350818d615b, So we are, I guess, ready to merge this one.

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PR Review: https://git.openjdk.org/jdk/pull/18162#pullrequestreview-2356034656