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 cee90a9df1f6628852519bd73bd395eeaeecd948..70df41f49c453d878911257926a26aac9904ea1f 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -185,7 +185,8 @@ class LChunkBuilder;
   V(ForInPrepareMap)                           \
   V(ForInCacheArray)                           \
   V(CheckMapValue)                             \
-  V(LoadFieldByIndex)
+  V(LoadFieldByIndex)                          \
+  V(DateField)
 
 #define GVN_FLAG_LIST(V)                       \
   V(Calls)                                     \
@@ -4629,6 +4630,26 @@ class HValueOf: public HUnaryOperation {
 };
 
 
+class HDateField: public HUnaryOperation {
+ public:
+  HDateField(HValue* date, Smi* index)
+      : HUnaryOperation(date), index_(index) {
+    set_representation(Representation::Tagged());
+  }
+
+  Smi* index() const { return index_; }
+
+  virtual Representation RequiredInputRepresentation(int index) {
+    return Representation::Tagged();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(DateField)
+
+ private:
+  Smi* index_;
+};
+
+
 class HDeleteProperty: public HBinaryOperation {
  public:
   HDeleteProperty(HValue* context, HValue* obj, HValue* key)