Implement optional parameter handling in ARM vm.

runtime/vm/assembler_arm.h

 // Copyright (c) 2013, 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_ARM_H_
 #define VM_ASSEMBLER_ARM_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm.h directly; use assembler.h instead.
 #endif
@@ skipping 537 matching lines @@
 
   // Load and Store. May clobber IP.
   void LoadImmediate(Register rd, int32_t value, Condition cond = AL);
   void LoadSImmediate(SRegister sd, float value, Condition cond = AL);
   void LoadDImmediate(DRegister dd, double value,
                       Register scratch, Condition cond = AL);
   void MarkExceptionHandler(Label* label);
   void Drop(intptr_t stack_elements);
   void LoadObject(Register rd, const Object& object);
   void PushObject(const Object& object);
+  void CompareObject(Register rn, const Object& object);
   void LoadWordFromPoolOffset(Register rd, int32_t offset);
   void LoadFromOffset(LoadOperandType type,
                       Register reg,
                       Register base,
                       int32_t offset,
                       Condition cond = AL);
   void StoreToOffset(StoreOperandType type,
                      Register reg,
                      Register base,
                      int32_t offset,
@@ skipping 205 matching lines @@
     return *reg1 - *reg2;
   }
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_