Implement date library functions in C++.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index d2ac322f720e6a63136ee24511d94f532977fd64..3d5d8548cba14421833fa004202c4cad22d4ffc4 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -178,8 +178,7 @@ class LCodeGen;
   V(ForInCacheArray)                            \
   V(CheckMapValue)                              \
   V(LoadFieldByIndex)                           \
-  V(DateField)                                  \
-  V(SetDateField)
+  V(DateField)
 
 
 #define DECLARE_CONCRETE_INSTRUCTION(type, mnemonic)              \
@@ -991,34 +990,17 @@ class LValueOf: public LTemplateInstruction<1, 1, 0> {
 
 class LDateField: public LTemplateInstruction<1, 1, 0> {
  public:
-  LDateField(LOperand* date, int index) : index_(index) {
+  LDateField(LOperand* date, Smi* index) : index_(index) {
     inputs_[0] = date;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(ValueOf, "date-field")
   DECLARE_HYDROGEN_ACCESSOR(ValueOf)
 
-  int index() const { return index_; }
+  Smi* index() const { return index_; }
 
  private:
-  int index_;
-};
-
-
-class LSetDateField: public LTemplateInstruction<1, 2, 0> {
- public:
-  LSetDateField(LOperand* date, LOperand* value, int index) : index_(index) {
-    inputs_[0] = date;
-    inputs_[1] = value;
-  }
-
-  DECLARE_CONCRETE_INSTRUCTION(DateField, "date-set-field")
-  DECLARE_HYDROGEN_ACCESSOR(DateField)
-
-  int index() const { return index_; }
-
- private:
-  int index_;
+  Smi* index_;
 };