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

runtime/vm/assembler_x64.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_ASSEMBLER_X64_H_
 #define VM_ASSEMBLER_X64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_x64.h directly; use assembler.h instead.
 #endif
@@ skipping 578 matching lines @@
   }
 
   void SmiUntag(Register reg) {
     sarq(reg, Immediate(kSmiTagSize));
   }
 
   int PreferredLoopAlignment() { return 16; }
   void Align(int alignment, int offset);
   void Bind(Label* label);
 
-  void Comment(const char* format, ...);
+  void Comment(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
   const Code::Comments& GetCodeComments() const;
 
   int CodeSize() const { return buffer_.Size(); }
   int prolog_offset() const { return prolog_offset_; }
   const ZoneGrowableArray<int>& GetPointerOffsets() const {
     return buffer_.pointer_offsets();
   }
 
   void FinalizeInstructions(const MemoryRegion& region) {
     buffer_.FinalizeInstructions(region);
@@ skipping 95 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_