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

test/cctest/test-feedback-vector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 
 #include "src/api.h"
 #include "src/debug.h"
 #include "src/execution.h"
 #include "src/factory.h"
 #include "src/global-handles.h"
 #include "src/macro-assembler.h"
 #include "src/objects.h"
 
 using namespace v8::internal;
 
 namespace {
 
 TEST(VectorStructure) {
   LocalContext context;
   v8::HandleScope scope(context->GetIsolate());
   Isolate* isolate = CcTest::i_isolate();
   Factory* factory = isolate->factory();
   Zone* zone = isolate->runtime_zone();
 
   // 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());
   CHECK_EQ(0, vector->Slots());
   CHECK_EQ(0, vector->ICSlots());
 
   FeedbackVectorSpec one_slot(1);
   vector = factory->NewTypeFeedbackVector(&one_slot);
   CHECK_EQ(1, vector->Slots());
   CHECK_EQ(0, vector->ICSlots());
@@ skipping 337 matching lines @@
   CHECK(number_map_found && o_map_found);
 
   // The degree of polymorphism doesn't change.
   CompileRun("f(100)");
   CHECK_EQ(POLYMORPHIC, nexus.StateFromFeedback());
   MapHandleList maps2;
   nexus.FindAllMaps(&maps2);
   CHECK_EQ(2, maps2.length());
 }
 }