RFR: 8327652: S390x: Implements SLP support [v5]

[Martin Doerr]

On Wed, 20 Mar 2024 16:32:50 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:
> 
>   Address code cleanup review comments

LGTM. Please make sure to have substantial test coverage with AND without SuperwordUseVX enabled. The assembler instructions and their usage need to be reviewed by somebody else.

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Marked as reviewed by mdoerr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18162#pullrequestreview-1954477673