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

test/cctest/test-feedback-vector.cc

Index: test/cctest/test-feedback-vector.cc
diff --git a/test/cctest/test-feedback-vector.cc b/test/cctest/test-feedback-vector.cc
index 0750f82b89f5ccaa8b36efb18ebc24c1229c5115..52bf46295c2f304d61a3eb157364fb4d9c98af9e 100644
--- a/test/cctest/test-feedback-vector.cc
+++ b/test/cctest/test-feedback-vector.cc
@@ -27,8 +27,8 @@ TEST(VectorStructure) {
   // Empty vectors are the empty fixed array.
   FeedbackVectorSpec empty;
   Handle<TypeFeedbackVector> vector = factory->NewTypeFeedbackVector(&empty);
-  CHECK(Handle<FixedArray>::cast(vector)
-            .is_identical_to(factory->empty_fixed_array()));
+  CHECK(Handle<Object>::cast(vector)
+            .is_identical_to(factory->empty_feedback_vector()));
   // Which can nonetheless be queried.
   CHECK_EQ(0, vector->ic_with_type_info_count());
   CHECK_EQ(0, vector->ic_generic_count());