[jdk17u-dev] RFR: 8307423: [s390x] Represent Registers as values

[Amit Kumar]

Hi all,

This pull request contains a backport of commit [8bbd264c](https://github.com/openjdk/jdk/commit/8bbd264c6e4b4045a218f11ae6b5b4f395bc2aa9) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Amit Kumar on 8 May 2023 and was reviewed by Martin Doerr and Lutz Schmidt.

Thanks!

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Commit messages:
 - removes register_definitions_s390 & updates vmStructs
 - Merge branch 'openjdk:master' into backport-offamitkumar-8bbd264c
 - extra space
 - update
 - Backport 8bbd264c6e4b4045a218f11ae6b5b4f395bc2aa9

Changes: https://git.openjdk.org/jdk17u-dev/pull/2453/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2453&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307423
  Stats: 518 lines in 10 files changed: 83 ins; 261 del; 174 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2453.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2453/head:pull/2453

PR: https://git.openjdk.org/jdk17u-dev/pull/2453