Dedupe code for array/object initialization on ARM.

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 650 matching lines @@
   void StoreIntoObjectNoBarrierOffset(Register object,
                                       int32_t offset,
                                       Register value);
   void StoreIntoObjectNoBarrier(Register object,
                                 const Address& dest,
                                 const Object& value);
   void StoreIntoObjectNoBarrierOffset(Register object,
                                       int32_t offset,
                                       const Object& value);
 
+  // Store value_even, value_odd, value_even, ... into the words in the address
+  // range [begin, end), assumed to be uninitialized fields in object (tagged).
+  // The stores must not need a generational store barrier (e.g., smi/null),
+  // and (value_even, value_odd) must be a valid register pair.
+  void InitializeFieldsNoBarrier(Register object,
+                                 Register begin,
+                                 Register end,
+                                 Register value_even,
+                                 Register value_odd);
+
   void LoadClassId(Register result, Register object, Condition cond = AL);
   void LoadClassById(Register result, Register class_id);
   void LoadClass(Register result, Register object, Register scratch);
   void CompareClassId(Register object, intptr_t class_id, Register scratch);
   void LoadTaggedClassIdMayBeSmi(Register result, Register object);
 
   void LoadWordFromPoolOffset(Register rd, int32_t offset, Condition cond = AL);
   void LoadFromOffset(OperandSize type,
                       Register reg,
                       Register base,
@@ skipping 343 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_