Adds ARM arm assembler tests.

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 55 matching lines @@
     UNIMPLEMENTED();
     return false;
   }
 };
 
 
 // Encodes Addressing Mode 1 - Data-processing operands.
 class ShifterOperand : public ValueObject {
  public:
   // Data-processing operands - Uninitialized.
-  ShifterOperand() : type_(-1) { }
+  ShifterOperand() : type_(-1), encoding_(-1) { }
 
   // Data-processing operands - Copy constructor.
   ShifterOperand(const ShifterOperand& other)
       : ValueObject(), type_(other.type_), encoding_(other.encoding_) { }
 
   // Data-processing operands - Assignment operator.
   ShifterOperand& operator=(const ShifterOperand& other) {
     type_ = other.type_;
     encoding_ = other.encoding_;
     return *this;
@@ skipping 551 matching lines @@
     return *reg1 - *reg2;
   }
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_