Tag smi-constants as smi. This also fixes code that copies holes into arrays.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 631ce9a28ab44d45e454922f73a6f22186815bef..f7121245cbcdc01fda25a2e5279c526476f05689 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -303,8 +303,6 @@ class HGraph: public ZoneObject {
   HConstant* GetConstantUndefined() const { return undefined_constant_.get(); }
   HConstant* GetConstant0();
   HConstant* GetConstant1();
-  HConstant* GetConstantSmi0();
-  HConstant* GetConstantSmi1();
   HConstant* GetConstantMinus1();
   HConstant* GetConstantTrue();
   HConstant* GetConstantFalse();
@@ -405,8 +403,6 @@ class HGraph: public ZoneObject {
  private:
   HConstant* GetConstantInt32(SetOncePointer<HConstant>* pointer,
                               int32_t integer_value);
-  HConstant* GetConstantSmi(SetOncePointer<HConstant>* pointer,
-                            int32_t integer_value);
 
   void MarkLive(HValue* ref, HValue* instr, ZoneList<HValue*>* worklist);
   void MarkLiveInstructions();
@@ -439,8 +435,6 @@ class HGraph: public ZoneObject {
   SetOncePointer<HConstant> undefined_constant_;
   SetOncePointer<HConstant> constant_0_;
   SetOncePointer<HConstant> constant_1_;
-  SetOncePointer<HConstant> constant_smi_0_;
-  SetOncePointer<HConstant> constant_smi_1_;
   SetOncePointer<HConstant> constant_minus1_;
   SetOncePointer<HConstant> constant_true_;
   SetOncePointer<HConstant> constant_false_;