RFR: Merge openjdk/jdk21u-dev:master

[William Kemper]

Merges tag jdk-21.0.2+13

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Commit messages:
 - Merge
 - 8322883: [BACKOUT] 8225377: type annotations are not visible to javac plugins across compilation boundaries
 - Merge
 - 8317547: Enhance TLS connection support
 - Merge
 - Merge
 - 8320001: javac crashes while adding type annotations to the return type of a constructor
 - Merge remote-tracking branch 'jdk21u/master' into jdk21.0.2
 - Merge remote-tracking branch 'jdk21u/master' into jdk21.0.2
 - 8314307: Improve loop handling
 - ... and 33 more: https://git.openjdk.org/shenandoah-jdk21u/compare/75929836...375769c6

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/18/files
  Stats: 1583 lines in 31 files changed: 562 ins; 792 del; 229 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/18.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/18/head:pull/18

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/18