Specialize mint shift code on arm for a constant shift amount.

runtime/vm/locations.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_LOCATIONS_H_
 #define VM_LOCATIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/bitfield.h"
@@ skipping 316 matching lines @@
 
   // Return a memory operand for stack slot locations.
   Address ToStackSlotAddress() const;
 
   // Returns the offset from the frame pointer for stack slot locations.
   intptr_t ToStackSlotOffset() const;
 
   // Constants.
   static Location RegisterOrConstant(Value* value);
   static Location RegisterOrSmiConstant(Value* value);
+  static Location WritableRegisterOrSmiConstant(Value* value);
   static Location FixedRegisterOrConstant(Value* value, Register reg);
   static Location FixedRegisterOrSmiConstant(Value* value, Register reg);
   static Location AnyOrConstant(Value* value);
 
   const char* Name() const;
   void PrintTo(BufferFormatter* f) const;
   void Print() const;
   const char* ToCString() const;
 
   // Compare two locations.
@@ skipping 289 matching lines @@
   BitmapBuilder* stack_bitmap_;
 
   const ContainsCall contains_call_;
   RegisterSet live_registers_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_LOCATIONS_H_