[jdk8u-dev] RFR: 8207011: Remove uses of the register storage class specifier

[Jan Kratochvil]

Make jdk8 natively buildable on a recent Linux system (tested Fedora 40 = gcc-14.1).
Cherry-pick was not clean but removing **register** is a simple task.

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Commit messages:
 - Merge remote-tracking branch 'jdk8u-dev/master' into register
 - 8207011: Remove uses of the register storage class specifier

Changes: https://git.openjdk.org/jdk8u-dev/pull/508/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=508&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8207011
  Stats: 53 lines in 12 files changed: 0 ins; 0 del; 53 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/508.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/508/head:pull/508

PR: https://git.openjdk.org/jdk8u-dev/pull/508