RFR: Merge openjdk/jdk:master

[William Kemper]

Merges tag jdk-21+19

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Commit messages:
 - Merge tag 'jdk-21+19' into merge-jdk-21-19
 - 8306372: Open source AWT CardLayout and Checkbox tests
 - 8306280: Open source several choice AWT tests
 - 8306452: Fix Amazon copyright in JDK-8305425 test
 - 8306321: Add an accessor for the top of a PLAB
 - 8306134: Open source some AWT tests relating to Button and a few other classes
 - 8306135: Clean up and open source some AWT tests
 - 8306323: Update license files in CLDR v43
 - 8303431: [JVMCI] libgraal annotation API
 - 8306038: SystemModulesPlugin generates code that doesn't pop when return value not used
 - ... and 88 more: https://git.openjdk.org/shenandoah/compare/64d14f3b...b66ce2cc

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=shenandoah&pr=265&range=00.0
 - openjdk/jdk:master: https://webrevs.openjdk.org/?repo=shenandoah&pr=265&range=00.1

Changes: https://git.openjdk.org/shenandoah/pull/265/files
  Stats: 231193 lines in 1578 files changed: 214741 ins; 5460 del; 10992 mod
  Patch: https://git.openjdk.org/shenandoah/pull/265.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/265/head:pull/265

PR: https://git.openjdk.org/shenandoah/pull/265