lldb/libstdc++: containers with allocator not supported

i'm using qtcreator with lldb as debugger on linux (gcc&clang with libstdc++)

when using std containers with allocators (like `std::pmr::list` or `std::pmr::deque`) qtcreator cannot show the values (the "locals" widget shows them as `<not accessible>`). using gdb as debugger or using lldb and avoiding custom allocators, the container is properly shown (with all container elements being expanded).