If the input to an HChange is of type smi, then no need to mark gvn flag changes new space promotio…

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index bd1dd403a79cbd397b2a9c56a48a590c71443216..74f7da8597616ebf0f98d27cc7f674f20e09405f 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1757,11 +1757,15 @@ class HChange: public HUnaryOperation {
     ASSERT(!value->representation().IsNone() && !to.IsNone());
     ASSERT(!value->representation().Equals(to));
     set_representation(to);
-    set_type(HType::TaggedNumber());
     SetFlag(kUseGVN);
     if (deoptimize_on_undefined) SetFlag(kDeoptimizeOnUndefined);
     if (is_truncating) SetFlag(kTruncatingToInt32);
-    if (to.IsTagged()) SetGVNFlag(kChangesNewSpacePromotion);
+    if (value->type().IsSmi()) {
+      set_type(HType::Smi());
+    } else {
+      set_type(HType::TaggedNumber());
+      if (to.IsTagged()) SetGVNFlag(kChangesNewSpacePromotion);
+    }
   }
 
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited);