Smi-support for HSar.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index c36388ee6abd359898fe1f57134b8e9f19311d81..e5f5692feb7e8a634c0b1458cda0abca4b3e697b 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -4972,7 +4972,9 @@ class HSar: public HBitwiseBinaryOperation {
   virtual void UpdateRepresentation(Representation new_rep,
                                     HInferRepresentationPhase* h_infer,
                                     const char* reason) {
-    if (new_rep.IsSmi()) new_rep = Representation::Integer32();
+    if (new_rep.IsSmi() && !right()->IsConstant()) {
+      new_rep = Representation::Integer32();
+    }
     HBitwiseBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
   }