RFR: Merge openjdk/jdk21u-dev:master [v2]

[William Kemper]

> Merges tag jdk-21.0.6+4

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/shenandoah-jdk21u/pull/138/files
  - new: https://git.openjdk.org/shenandoah-jdk21u/pull/138/files/4b1365ea..4b1365ea

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=138&range=01
 - incr: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=138&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/138.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/138/head:pull/138

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/138