RFR: Merge jdk18

[Jesper Wilhelmsson]

Forwardport JDK 18 -> JDK 19

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Commit messages:
 - Merge
 - 8277964: ClassCastException with no stack trace is thrown with -Xcomp in method handle invocation
 - 8272064: test/jdk/jdk/jfr/api/consumer/TestHiddenMethod.java needs update for JEP 416
 - 8278607: Misc issues in foreign API javadoc
 - 8278233: [macos] tools/jpackage tests timeout due to /usr/bin/osascript
 - 8278758: runtime/BootstrapMethod/BSMCalledTwice.java fails with release VMs after JDK-8262134
 - 8278744: KeyStore:getAttributes() not returning unmodifiable Set
 - 8277919: OldObjectSample event causing bloat in the class constant pool in JFR recording
 - 8262134: compiler/uncommontrap/TestDeoptOOM.java failed with "guarantee(false) failed: wrong number of expression stack elements during deopt"

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

Changes: https://git.openjdk.java.net/jdk/pull/6856/files
  Stats: 341 lines in 27 files changed: 269 ins; 12 del; 60 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6856.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6856/head:pull/6856

PR: https://git.openjdk.java.net/jdk/pull/6856