RFR: Merge jdk18

[Jesper Wilhelmsson]

Forwardport JDK 18 -> JDK 19

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Commit messages:
 - Merge
 - 8132785: java/lang/management/ThreadMXBean/ThreadLists.java fails intermittently
 - 8273108: RunThese24H crashes with SEGV in markWord::displaced_mark_helper() after JDK-8268276
 - 8278580: ProblemList javax/swing/JTree/4908142/bug4908142.java on macosx-x64
 - 8277299: STACK_OVERFLOW in Java_sun_awt_shell_Win32ShellFolder2_getIconBits

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

Changes: https://git.openjdk.java.net/jdk/pull/6824/files
  Stats: 119 lines in 6 files changed: 85 ins; 1 del; 33 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6824.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6824/head:pull/6824

PR: https://git.openjdk.java.net/jdk/pull/6824