arm: Move unrolled array initialization to Assembler.

runtime/vm/assembler_arm.cc

Index: runtime/vm/assembler_arm.cc
===================================================================
--- runtime/vm/assembler_arm.cc	(revision 41908)
+++ runtime/vm/assembler_arm.cc	(working copy)
@@ -1759,6 +1759,33 @@
 }
 
 
+void Assembler::InitializeFieldsNoBarrierUnrolled(Register object,
+                                                  Register begin,
+                                                  intptr_t count,
+                                                  Register value_even,
+                                                  Register value_odd) {
+  ASSERT(value_odd == value_even + 1);
+  intptr_t current_offset = 0;
+  const intptr_t end_offset = count * kWordSize;
+  while (current_offset + kWordSize < end_offset) {
+    strd(value_even, Address(begin, current_offset));
+    current_offset += 2*kWordSize;
+  }
+  while (current_offset < end_offset) {
+    str(value_even, Address(begin, current_offset));
+    current_offset += kWordSize;
+  }
+#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);