Fix HCheckSmiOrInt32 fake observed representation.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 27675606056852a9093c827bf9ff16c0b18d09d4..2e7e374025a5b017b42e8b49d6e9dc2566d47c7b 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2819,6 +2819,10 @@ class HCheckSmiOrInt32: public HUnaryOperation {
   }
   virtual void InferRepresentation(HInferRepresentation* h_infer);
 
+  virtual Representation observed_input_representation(int index) {
+    return Representation::Integer32();
+  }
+
   virtual HValue* Canonicalize() {
     if (representation().IsTagged() && !type().IsSmi()) {
       return this;