Dedupe code for array/object initialization on ARM.

runtime/vm/assembler_arm.cc

Index: runtime/vm/assembler_arm.cc
===================================================================
--- runtime/vm/assembler_arm.cc	(revision 41855)
+++ runtime/vm/assembler_arm.cc	(working copy)
@@ -1735,6 +1735,30 @@
 }
 
 
+void Assembler::InitializeFieldsNoBarrier(Register object,
+                                          Register begin,
+                                          Register end,
+                                          Register value_even,
+                                          Register value_odd) {
+  ASSERT(value_odd == value_even + 1);
+  Label init_loop;
+  Bind(&init_loop);
+  AddImmediate(begin, 2 * kWordSize);
+  cmp(begin, Operand(end));
+  strd(value_even, Address(begin, -2 * kWordSize), LS);
+  b(&init_loop, CC);
+  str(value_even, Address(begin, -2 * kWordSize), HI);
+#if defined(DEBUG)
+  Label done;
+  StoreIntoObjectFilter(object, value_even, &done);
+  StoreIntoObjectFilter(object, value_odd, &done);
+  Stop("Store buffer update is required");
+  Bind(&done);
+#endif  // defined(DEBUG)
+  // No store buffer update.
+}
+
+
 void Assembler::LoadClassId(Register result, Register object, Condition cond) {
   ASSERT(RawObject::kClassIdTagPos == 16);
   ASSERT(RawObject::kClassIdTagSize == 16);