[libc++] Enable the GDB pretty printers for Clang

Author: philnik777

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

@@ -8,12 +8,10 @@
 
 // REQUIRES: host-has-gdb-with-python
 // REQUIRES: locale.en_US.UTF-8
+// REQUIRES: optimization=none
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: c++03
 
-// TODO: Investigate these failures which break the CI.
-// UNSUPPORTED: clang-18, clang-19, clang-20, clang-21
-
 // The Android libc++ tests are run on a non-Android host, connected to an
 // Android device over adb. gdb needs special support to make this work (e.g.
 // gdbclient.py, ndk-gdb.py, gdbserver), and the Android organization doesn't