[jdk23u] RFR: Merge jdk:jdk23

[Sean Coffey]

merge

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

Commit messages:
 - Merge remote-tracking branch 'jdk/jdk23' into Merge-June-2
 - 8326820: Metadata artificially kept alive
 - 8333849: (dc) DatagramChannel send/receive fails with UOE if buffer backed by memory segment allocated from shared arena
 - 8335220: C2: Missing check for Opaque4 node in EscapeAnalysis
 - 8334886: jdk/jfr/api/recording/time/TestTimeMultiple.java failed with RuntimeException: getStopTime() > afterStop
 - 8334421: assert(!oldbox->is_unbalanced()) failed: this should not be called for unbalanced region
 - 8326705: Test CertMsgCheck.java fails to find alert certificate_required
 - 8324781: runtime/Thread/TestAlwaysPreTouchStacks.java failed with Expected a higher ratio between stack committed and reserved
 - 8333583: Crypto-XDH.generateSecret regression after JDK-8329538
 - 8334629: [BACKOUT] PhaseIdealLoop::conditional_move is too conservative
 - ... and 6 more: https://git.openjdk.org/jdk23u/compare/d494c21b...479e0ef0

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

Changes: https://git.openjdk.org/jdk23u/pull/12/files
  Stats: 1259 lines in 45 files changed: 936 ins; 160 del; 163 mod
  Patch: https://git.openjdk.org/jdk23u/pull/12.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/12/head:pull/12

PR: https://git.openjdk.org/jdk23u/pull/12