RFR: 8359114: [s390x] Add z17 detection code [v2]

[Manjunath S Matti.]

On Wed, 11 Jun 2025 13:09:45 GMT, Manjunath S Matti. <duke at openjdk.org> wrote:

>> Add support to detect the new generation of Z machine (z17).
>
> Manjunath S Matti. has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Correct the comments for the bits covered in DW[2] and DW[3].

@RealLucy or @theRealAph please provide the 2nd review

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PR Comment: https://git.openjdk.org/jdk/pull/25718#issuecomment-3044117259