[jdk21u-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 d8b3685d36873904248e9701f66459e074a4a8ab

Changes: https://git.openjdk.org/jdk21u-dev/pull/1152/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1152&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/jdk21u-dev/pull/1152.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1152/head:pull/1152

PR: https://git.openjdk.org/jdk21u-dev/pull/1152