Teach the assembler how to generate multi-byte nops. Teach the

runtime/vm/assembler_ia32.h

 // Copyright (c) 2011, 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_IA32_H_
 #define VM_ASSEMBLER_IA32_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_ia32.h directly; use assembler.h instead.
 #endif
@@ skipping 467 matching lines @@
 
   void negl(Register reg);
   void notl(Register reg);
 
   void enter(const Immediate& imm);
   void leave();
 
   void ret();
   void ret(const Immediate& imm);
 
-  void nop();
+  // 'size' indicates size in bytes and must be in the range 1..8.
+  void nop(int size = 1);
   void int3();
   void hlt();
 
   void j(Condition condition, Label* label, bool near = kFarJump);
   void j(Condition condition, const ExternalLabel* label);
 
   void jmp(Register reg);
   void jmp(Label* label, bool near = kFarJump);
   void jmp(const ExternalLabel* label);
 
@@ skipping 115 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_IA32_H_