Track field types.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 83f11e7f16618a52699c857efd176e0b0c8959bd..f41ca7b6197475af4e26701baac5078b08221332 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -269,6 +269,7 @@ bool Object::IsExternalTwoByteString() {
          String::cast(this)->IsTwoByteRepresentation();
 }
 
+
 bool Object::HasValidElements() {
   // Dictionary is covered under FixedArray.
   return IsFixedArray() || IsFixedDoubleArray() || IsExternalArray() ||
@@ -2621,14 +2622,6 @@ void DescriptorArray::SetRepresentation(int descriptor_index,
 }
 
 
-void DescriptorArray::InitializeRepresentations(Representation representation) {
-  int length = number_of_descriptors();
-  for (int i = 0; i < length; i++) {
-    SetRepresentation(i, representation);
-  }
-}
-
-
 Object** DescriptorArray::GetValueSlot(int descriptor_number) {
   ASSERT(descriptor_number < number_of_descriptors());
   return RawFieldOfElementAt(ToValueIndex(descriptor_number));
@@ -2641,6 +2634,11 @@ Object* DescriptorArray::GetValue(int descriptor_number) {
 }
 
 
+void DescriptorArray::SetValue(int descriptor_index, Object* value) {
+  set(ToValueIndex(descriptor_index), value);
+}
+
+
 PropertyDetails DescriptorArray::GetDetails(int descriptor_number) {
   ASSERT(descriptor_number < number_of_descriptors());
   Object* details = get(ToDetailsIndex(descriptor_number));