Uglify and try to also handle ELF

Author: ldionne

libcxx/include/typeinfo

@@ -275,13 +275,15 @@ struct __type_info_implementations {
           __impl;
 };
 
-#    if __has_cpp_attribute(clang::ptrauth_vtable_pointer)
-#      if __has_feature(ptrauth_type_info_discriminated_vtable_pointer)
+#    if __has_cpp_attribute(_Clang::__ptrauth_vtable_pointer__) && __has_feature(__ptrauth_calls__)
+#      if __has_feature(__ptrauth_vtable_address_discrimination__) ||                                                  \
+          __has_feature(__ptrauth_vtable_type_discrimination__)
 #        define _LIBCPP_TYPE_INFO_VTABLE_POINTER_AUTH                                                                  \
-          [[clang::ptrauth_vtable_pointer(process_independent, address_discrimination, type_discrimination)]]
+          [[_Clang::__ptrauth_vtable_pointer__(process_independent, address_discrimination, type_discrimination)]]
 #      else
 #        define _LIBCPP_TYPE_INFO_VTABLE_POINTER_AUTH                                                                  \
-          [[clang::ptrauth_vtable_pointer(process_independent, no_address_discrimination, no_extra_discrimination)]]
+          [[_Clang::__ptrauth_vtable_pointer__(                                                                        \
+              process_independent, no_address_discrimination, no_extra_discrimination)]]
 #      endif
 #    else
 #      define _LIBCPP_TYPE_INFO_VTABLE_POINTER_AUTH