[jdk17u-dev] RFR: 8342607: Enhance register printing on x86_64 platforms

[Martin Doerr]

Clean backport of [JDK-8342607](https://bugs.openjdk.org/browse/JDK-8342607).

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Commit messages:
 - Backport 1bfb57dca4a65ea64a15914b1e8b5c4c509db6f5

Changes: https://git.openjdk.org/jdk17u-dev/pull/3061/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3061&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342607
  Stats: 37 lines in 3 files changed: 36 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3061.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3061/head:pull/3061

PR: https://git.openjdk.org/jdk17u-dev/pull/3061