Vector ICs: Introduce an InstanceType for the type feedback vector.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 1e40ac5d9c12f6b253f75530812d4f4bc41573ea..252daa9864f01b0fe515bb804df92979de0382dd 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -142,7 +142,7 @@ int PropertyDetails::field_width_in_words() const {
 
 bool Object::IsFixedArrayBase() const {
   return IsFixedArray() || IsFixedDoubleArray() || IsFixedTypedArrayBase() ||
-         IsExternalArray();
+         IsExternalArray() || IsTypeFeedbackVector();
 }
 
 
@@ -718,6 +718,7 @@ TYPE_CHECKER(Map, MAP_TYPE)
 TYPE_CHECKER(FixedArray, FIXED_ARRAY_TYPE)
 TYPE_CHECKER(FixedDoubleArray, FIXED_DOUBLE_ARRAY_TYPE)
 TYPE_CHECKER(WeakFixedArray, FIXED_ARRAY_TYPE)
+TYPE_CHECKER(TypeFeedbackVector, FEEDBACK_VECTOR_TYPE)
 
 
 bool Object::IsJSWeakCollection() const {
@@ -743,9 +744,6 @@ bool Object::IsTransitionArray() const {
 }
 
 
-bool Object::IsTypeFeedbackVector() const { return IsFixedArray(); }
-
-
 bool Object::IsDeoptimizationInputData() const {
   // Must be a fixed array.
   if (!IsFixedArray()) return false;
@@ -2269,7 +2267,8 @@ void FixedArray::set(int index, Smi* value) {
 
 void FixedArray::set(int index, Object* value) {
   DCHECK_NE(GetHeap()->fixed_cow_array_map(), map());
-  DCHECK_EQ(FIXED_ARRAY_TYPE, map()->instance_type());
+  DCHECK(map()->instance_type() == FIXED_ARRAY_TYPE ||
+         map()->instance_type() == FEEDBACK_VECTOR_TYPE);
   DCHECK(index >= 0 && index < this->length());
   int offset = kHeaderSize + index * kPointerSize;
   WRITE_FIELD(this, offset, value);
@@ -4111,7 +4110,8 @@ int HeapObject::SizeFromMap(Map* map) {
   if (instance_size != kVariableSizeSentinel) return instance_size;
   // Only inline the most frequent cases.
   InstanceType instance_type = map->instance_type();
-  if (instance_type == FIXED_ARRAY_TYPE) {
+  if (instance_type == FIXED_ARRAY_TYPE ||
+      instance_type == FEEDBACK_VECTOR_TYPE) {
     return FixedArray::BodyDescriptor::SizeOf(map, this);
   }
   if (instance_type == ONE_BYTE_STRING_TYPE ||