RFR: JDK-8216437 : PPC64: Add intrinsic for GHASH algorithm [v17]

[Martin Doerr]

On Tue, 28 Jan 2025 16:23:48 GMT, Suchismith Roy <sroy at openjdk.org> wrote:

>> JBS Issue : [JDK-8216437](https://bugs.openjdk.org/browse/JDK-8216437)
>> 
>> Currently acceleration code for GHASH is missing for PPC64. 
>> 
>> The current implementation utlilises SIMD instructions on Power and uses Karatsuba multiplication for obtaining the final result.
>
> Suchismith Roy has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - restore chnges
>  - restore chnges

You will have to merge and make adaptations for https://github.com/openjdk/jdk/commit/a414a591dd8d66f1500cd69dd65baa6ba4224c2a.

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PR Comment: https://git.openjdk.org/jdk/pull/20235#issuecomment-2629494285