Fix missing representation for the result of HIsSmiAndBranch.

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4385 matching lines @@
   }
 
  protected:
   virtual bool DataEquals(HValue* other) V8_OVERRIDE { return true; }
   virtual int RedefinedOperandIndex() { return 0; }
 
  private:
   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());
+  }
 };
 
 
 class HIsUndetectableAndBranch V8_FINAL : public HUnaryControlInstruction {
  public:
   DECLARE_INSTRUCTION_FACTORY_P1(HIsUndetectableAndBranch, HValue*);
   DECLARE_INSTRUCTION_FACTORY_P3(HIsUndetectableAndBranch, HValue*,
                                  HBasicBlock*, HBasicBlock*);
 
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
@@ skipping 3102 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_