[jdk17u-dev] RFR: 8342607: Enhance register printing on x86_64 platforms [v2]

[Martin Doerr]

> Clean backport of [JDK-8342607](https://bugs.openjdk.org/browse/JDK-8342607) plus small part of https://github.com/openjdk/jdk/commit/98ce45ff7432a56d73b51046817b5fe84a412042 (2nd commit, may help other backports, too).

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Add small part of JDK-8292981.

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/3061/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/3061/files/dad1c36c..5ad2abc9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3061&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3061&range=00-01

  Stats: 6 lines in 1 file changed: 2 ins; 0 del; 4 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