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

[Amit Kumar]

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].

LGTM. 

@RealLucy would  you provide 2nd review ?

I crashed JVM manually and in the hs_err file I see that z17 is detected properly; 


CPU: total 64 (initial active 64) system-z, g11-z17, ldisp_fast, extimm, pcrel_load/store, cmpb, cond_load/store, interlocked_update, txm, vectorinstr, instrext2, venh1, instrext3, venh2,bear_enh, sort_enh, nnpa_assist, storage_key_removal, vpack_decimal_enh, concurrent_function, out-of-support_as_of_tbd, aes128, aes192, aes256, sha1, sha256, sha512, ghash

-------------

Marked as reviewed by amitkumar (Committer).

PR Review: https://git.openjdk.org/jdk/pull/25718#pullrequestreview-2919807992
PR Comment: https://git.openjdk.org/jdk/pull/25718#issuecomment-2965391369