RFR: Merge openjdk/jdk21u:master

[William Kemper]

Merge tip of jdk21u

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Commit messages:
 - Merge 'openjdk-21u/master' into 'shenandoah-jdk21u/master'
 - 8320001: javac crashes while adding type annotations to the return type of a constructor
 - 8320601: ProblemList java/lang/invoke/lambda/LambdaFileEncodingSerialization.java on linux-all
 - 8320363: ppc64 TypeEntries::type_unknown logic looks wrong, missed optimization opportunity
 - 8315684: Parallelize sun/security/util/math/TestIntegerModuloP.java
 - 8315936: Parallelize gc/stress/TestStressG1Humongous.java test
 - 8316401: sun/tools/jhsdb/JStackStressTest.java failed with "InternalError: We should have found a thread that owns the anonymous lock"
 - 8318895: Deoptimization results in incorrect lightweight locking stack
 - 8318078: ADLC: pass ASSERT and PRODUCT flags
 - 8319120: Unbound ScopedValue.get() throws the wrong exception
 - ... and 59 more: https://git.openjdk.org/shenandoah-jdk21u/compare/08570451...7c145a52

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

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/2/files
  Stats: 17927 lines in 348 files changed: 11041 ins; 1810 del; 5076 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/2.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/2/head:pull/2

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/2