Implement date library functions in C++.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 5c23e730f6ec6217300df0c608d1aafe380eb675..5733e51affcc643d1377c1012848ecf9f5761b1e 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -185,8 +185,7 @@ class LChunkBuilder;
   V(ForInCacheArray)                           \
   V(CheckMapValue)                             \
   V(LoadFieldByIndex)                          \
-  V(DateField)                                 \
-  V(SetDateField)
+  V(DateField)
 
 #define GVN_FLAG_LIST(V)                       \
   V(Calls)                                     \
@@ -4606,11 +4605,12 @@ class HValueOf: public HUnaryOperation {
 
 class HDateField: public HUnaryOperation {
  public:
-  HDateField(HValue* date, int index) : HUnaryOperation(date), index_(index) {
+  HDateField(HValue* date, Smi* index)
+      : HUnaryOperation(date), index_(index) {
     set_representation(Representation::Tagged());
   }
 
-  int index() const { return index_; }
+  Smi* index() const { return index_; }
 
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::Tagged();
@@ -4619,27 +4619,7 @@ class HDateField: public HUnaryOperation {
   DECLARE_CONCRETE_INSTRUCTION(DateField)
 
  private:
-  int index_;
-};
-
-
-class HSetDateField: public HBinaryOperation {
- public:
-  HSetDateField(HValue* context, HValue* date, HValue* value, int index)
-    : HBinaryOperation(context, date, value), index_(index) {
-    set_representation(Representation::Tagged());
-  }
-
-  int index() const { return index_; }
-
-  virtual Representation RequiredInputRepresentation(int index) {
-    return Representation::Tagged();
-  }
-
-  DECLARE_CONCRETE_INSTRUCTION(SetDateField)
-
- private:
-  int index_;
+  Smi* index_;
 };