[TypeFeedbackVector] Root feedback vectors at function literal site.

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/debug.h"
 #include "src/execution.h"
@@ skipping 88 matching lines @@
   {
     FeedbackVectorSpec spec(&zone);
     spec.AddGeneralSlot();
     spec.AddCreateClosureSlot();
     spec.AddGeneralSlot();
     vector = NewTypeFeedbackVector(isolate, &spec);
     FeedbackVectorHelper helper(vector);
     CHECK_EQ(1, TypeFeedbackMetadata::GetSlotSize(
                     FeedbackVectorSlotKind::CREATE_CLOSURE));
     FeedbackVectorSlot slot = helper.slot(1);
-    FixedArray* array = FixedArray::cast(vector->Get(slot));
-    CHECK_EQ(array, *factory->empty_type_feedback_vector());
+    Cell* cell = Cell::cast(vector->Get(slot));
+    CHECK_EQ(cell->value(), *factory->undefined_value());
   }
 }
 
 
 // IC slots need an encoding to recognize what is in there.
 TEST(VectorICMetadata) {
   LocalContext context;
   v8::HandleScope scope(context->GetIsolate());
   Isolate* isolate = CcTest::i_isolate();
   Zone zone(isolate->allocator(), ZONE_NAME);
@@ skipping 499 matching lines @@
   // There should be one IC slot.
   Handle<TypeFeedbackVector> feedback_vector(f->feedback_vector());
   FeedbackVectorHelper helper(feedback_vector);
   CHECK_EQ(1, helper.slot_count());
   FeedbackVectorSlot slot(0);
   StoreICNexus nexus(feedback_vector, slot);
   CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
 }
 
 }  // namespace