[interop] fix test failure after c4cc9e8

rdar://107445101

Author: hyp

lib/PrintAsClang/PrintAsClang.cpp

@@ -67,6 +67,9 @@ static void writePtrauthPrologue(raw_ostream &os) {
           os << "# ifndef __ptrauth_swift_value_witness_function_pointer\n";
           os << "#  define __ptrauth_swift_value_witness_function_pointer(x)\n";
           os << "# endif\n";
+          os << "# ifndef __ptrauth_swift_class_method_pointer\n";
+          os << "#  define __ptrauth_swift_class_method_pointer(x)\n";
+          os << "# endif\n";
         });
     os << "#endif\n";
   });

test/PrintAsCxx/empty.swift

@@ -47,6 +47,9 @@
 // CHECK-NEXT:  # ifndef __ptrauth_swift_value_witness_function_pointer
 // CHECK-NEXT:  #  define __ptrauth_swift_value_witness_function_pointer(x)
 // CHECK-NEXT:  # endif
+// CHECK-NEXT:  # ifndef __ptrauth_swift_class_method_pointer
+// CHECK-NEXT:  # define __ptrauth_swift_class_method_pointer(x)
+// CHECK-NEXT:  # endif
 // CHECK-NEXT:  #pragma clang diagnostic pop
 // CHECK-NEXT:  #endif
 // CHECK-NEXT:  #endif