New class for Date objects: caches individual date components.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index de6800deb0b61ab43ad55bd68ca1e5616ce4b24f..bd68c123c5edaf88082ab09e44aad3769d2202e6 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -179,7 +179,9 @@ class LChunkBuilder;
   V(UnaryMathOperation)                        \
   V(UnknownOSRValue)                           \
   V(UseConst)                                  \
-  V(ValueOf)
+  V(ValueOf)                                   \
+  V(DateField)                                 \
+  V(SetDateField)
 
 #define GVN_FLAG_LIST(V)                       \
   V(Calls)                                     \
@@ -4510,6 +4512,45 @@ class HValueOf: public HUnaryOperation {
 };
 
 
+class HDateField: public HUnaryOperation {
+ public:
+  HDateField(HValue* date, int index) : HUnaryOperation(date), index_(index) {
+    set_representation(Representation::Tagged());
+  }
+
+  int index() const { return index_; }
+
+  virtual Representation RequiredInputRepresentation(int index) {
+    return Representation::Tagged();
+  }
+
+  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_;
+};
+
+
 class HDeleteProperty: public HBinaryOperation {
  public:
   HDeleteProperty(HValue* context, HValue* obj, HValue* key)