RFR: 8359114: [s390x] Add z17 detection code [v4]

[Manjunath S Matti.]

> Add support to detect the new generation of Z machine (z17).

Manjunath S Matti. has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Update full name
 - Correct the comments for the bits covered in DW[2] and DW[3].
 - Add support to detect the new generation of Z machine (z17).

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Changes: https://git.openjdk.org/jdk/pull/25718/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25718&range=03
  Stats: 21 lines in 2 files changed: 12 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/25718.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25718/head:pull/25718

PR: https://git.openjdk.org/jdk/pull/25718