Add attributions so printf like functions can have their arguments checked.

runtime/vm/class_finalizer.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_CLASS_FINALIZER_H_
 #define VM_CLASS_FINALIZER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 
@@ skipping 35 matching lines @@
                                        const AbstractType& type,
                                        FinalizationKind finalization);
 
   // Replace the malformed type with Dynamic and, depending on the given type
   // finalization mode and execution mode, mark the type as malformed or report
   // a compile time error. Prepend prev_error if not null.
   static void FinalizeMalformedType(const Error& prev_error,
                                     const Class& cls,
                                     const Type& type,
                                     FinalizationKind finalization,
-                                    const char* format, ...);
+                                    const char* format, ...)
+       PRINTF_ATTRIBUTE(5, 6);
 
   // Return false if we still have classes pending to be finalized.
   static bool AllClassesFinalized();
 
   // Return whether class finalization failed.
   // The function returns true if the finalization was successful.
   // If finalization fails, an error message is set in the sticky error field
   // in the object store.
   static bool FinalizePendingClasses();
 
@@ skipping 24 matching lines @@
   static void ResolveAndFinalizeUpperBounds(const Class& cls);
   static void ResolveAndFinalizeSignature(const Class& cls,
                                           const Function& function);
   static void ResolveAndFinalizeMemberTypes(const Class& cls);
   static void PrintClassInformation(const Class& cls);
   static void CollectInterfaces(const Class& cls,
                                 const GrowableObjectArray& interfaces);
   static void ReportError(const Error& error);
   static void ReportError(const Script& script,
                           intptr_t token_index,
-                          const char* format, ...);
-  static void ReportError(const char* format, ...);
+                          const char* format, ...) PRINTF_ATTRIBUTE(3, 4);
+  static void ReportError(const char* format, ...) PRINTF_ATTRIBUTE(1, 2);
 };
 
 }  // namespace dart
 
 #endif  // VM_CLASS_FINALIZER_H_