[libc++] Mark GDB pretty printers as unsupported on GCC 11.2 to make CI green

Author: ldionne

libcxx/test/libcxx/gdb/gdb_pretty_printer_test.sh.cpp

@@ -14,6 +14,9 @@
 // TODO: Investigate this failure, which happens only with the Bootstrapping build.
 // UNSUPPORTED: clang-14, clang-15
 
+// TODO: Investigate this failure on GCC 11.2 (in Ubuntu Jammy)
+// UNSUPPORTED: gcc-11.2
+
 // RUN: %{cxx} %{flags} %s -o %t.exe %{compile_flags} -g %{link_flags}
 // Ensure locale-independence for unicode tests.
 // RUN: env LANG=en_US.UTF-8 %{gdb} -nx -batch -iex "set autoload off" -ex "source %S/../../../utils/gdb/libcxx/printers.py" -ex "python register_libcxx_printer_loader()" -ex "source %S/gdb_pretty_printer_test.py" %t.exe