DBC: Implement TestCids instruction.

runtime/vm/assembler_dbc.h

 // Copyright (c) 2016, 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_DBC_H_
 #define VM_ASSEMBLER_DBC_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_dbc.h directly; use assembler.h instead.
 #endif
@@ skipping 148 matching lines @@
 #undef PARAMS_A_X
 #undef DECLARE_EMIT
 
   void Emit(int32_t value);
 
   void PushConstant(const Object& obj);
   void LoadConstant(uintptr_t ra, const Object& obj);
 
   intptr_t AddConstant(const Object& obj);
 
+  void Nop(intptr_t d) { Nop(0, d); }
+
  private:
   AssemblerBuffer buffer_;  // Contains position independent code.
   ObjectPoolWrapper object_pool_wrapper_;
 
   class CodeComment : public ZoneAllocated {
    public:
     CodeComment(intptr_t pc_offset, const String& comment)
         : pc_offset_(pc_offset), comment_(comment) { }
 
     intptr_t pc_offset() const { return pc_offset_; }
     const String& comment() const { return comment_; }
 
    private:
     intptr_t pc_offset_;
     const String& comment_;
 
     DISALLOW_COPY_AND_ASSIGN(CodeComment);
   };
 
   GrowableArray<CodeComment*> comments_;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_DBC_H_