Support Int32 representation for selected binary operations.

runtime/vm/flow_graph_compiler_ia32.cc

Index: runtime/vm/flow_graph_compiler_ia32.cc
diff --git a/runtime/vm/flow_graph_compiler_ia32.cc b/runtime/vm/flow_graph_compiler_ia32.cc
index 5705373aaa6ee1ad7664aaddc71c16ecca5dffdd..a00e8b99efe1c8f7d2133a56aadf0abce5920843 100644
--- a/runtime/vm/flow_graph_compiler_ia32.cc
+++ b/runtime/vm/flow_graph_compiler_ia32.cc
@@ -1576,6 +1576,9 @@ void ParallelMoveResolver::EmitMove(int index) {
       const Object& constant = source.constant();
       if (constant.IsSmi() && (Smi::Cast(constant).Value() == 0)) {
         __ xorl(destination.reg(), destination.reg());
+      } else if (constant.IsSmi() &&
+          source.constant_instruction()->representation() == kUnboxedInt32) {
+        __ movl(destination.reg(), Immediate(Smi::Cast(constant).Value()));
       } else {
         __ LoadObjectSafely(destination.reg(), constant);
       }
@@ -1609,7 +1612,14 @@ void ParallelMoveResolver::EmitMove(int index) {
       __ movsd(destination.ToStackSlotAddress(), XMM0);
     } else {
       ASSERT(destination.IsStackSlot());
-      StoreObject(destination.ToStackSlotAddress(), source.constant());
+      const Object& constant = source.constant();
+      if (constant.IsSmi() &&
+          source.constant_instruction()->representation() == kUnboxedInt32) {
+        __ movl(destination.ToStackSlotAddress(),
+                Immediate(Smi::Cast(constant).Value()));
+      } else {
+        StoreObject(destination.ToStackSlotAddress(), source.constant());
+      }
     }
   }