Dedupe code for array/object initialization on ARM.

runtime/vm/intermediate_language_arm.cc

Index: runtime/vm/intermediate_language_arm.cc
===================================================================
--- runtime/vm/intermediate_language_arm.cc	(revision 41855)
+++ runtime/vm/intermediate_language_arm.cc	(working copy)
@@ -2230,13 +2230,7 @@
         current_offset += kWordSize;
       }
     } else {
-      Label init_loop;
-      __ Bind(&init_loop);
-      __ AddImmediate(R8, 2 * kWordSize);
-      __ cmp(R8, Operand(R3));
-      __ strd(R6, Address(R8, -2 * kWordSize), LS);
-      __ b(&init_loop, CC);
-      __ str(R6, Address(R8, -2 * kWordSize), HI);
+      __ InitializeFieldsNoBarrier(R0, R8, R3, R6, R7);
     }
   }
   __ b(done);