[jdk21u] Integrated: Merge jdk21:master

[Rob McKenna]

Merge jdk21:master

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

Commit messages:
 - Merge
 - 8312619: Strange error message when switching over long
 - 8312984: javac may crash on a record pattern with too few components
 - 8312401: SymbolTable::do_add_if_needed hangs when called in InstanceKlass::add_initialization_error path with requesting length exceeds max_symbol_length
 - 8310211: serviceability/jvmti/thread/GetStackTrace/getstacktr03/getstacktr03.java failing
 - 8308609: java/lang/ScopedValue/StressStackOverflow.java fails with "-XX:-VMContinuations"
 - 8311955: c++filt is now ibm-llvm-cxxfilt when using xlc17 / clang on AIX
 - 8313428: GHA: Bump GCC versions for July 2023 updates
 - 8312591: GCC 6 build failure after JDK-8280982
 - 8310268: RISC-V: misaligned memory access in String.Compare intrinsic
 - ... and 22 more: https://git.openjdk.org/jdk21u/compare/bfe037a4...6a43ef5f

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

Changes: https://git.openjdk.org/jdk21u/pull/45/files
  Stats: 966 lines in 55 files changed: 653 ins; 113 del; 200 mod
  Patch: https://git.openjdk.org/jdk21u/pull/45.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/45/head:pull/45

PR: https://git.openjdk.org/jdk21u/pull/45