Fix missing representation for the result of HIsSmiAndBranch.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index d22cc32f1518ebf00545be935ad77e54ecc9323f..09050a5c13a0bab2360a3197ff7493d262cb822b 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -4403,7 +4403,9 @@ class HIsSmiAndBranch V8_FINAL : public HUnaryControlInstruction {
   HIsSmiAndBranch(HValue* value,
                   HBasicBlock* true_target = NULL,
                   HBasicBlock* false_target = NULL)
-      : HUnaryControlInstruction(value, true_target, false_target) {}
+      : HUnaryControlInstruction(value, true_target, false_target) {
+    set_representation(Representation::Tagged());
+  }
 };