RFR: 8336356: [s390x] preserve Vector Register before using for string compress / expand

[Amit Kumar]

On Mon, 25 Nov 2024 04:58:11 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> This PR adds `TEMP` effect for the vector register, allotted by register allocator, used in the string compress/expand intrinsic. Also it enabled the Vector computation part of those intrinsics which was disabled by https://github.com/openjdk/jdk/pull/18162
> 
> tier1 test, which also includes string intrinsic tests `compiler/intrinsics/string/` are clean. No regression seen.

@RealLucy 👀

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PR Comment: https://git.openjdk.org/jdk/pull/22354#issuecomment-2533619701