[TypeFeedbackVector] Root feedback vectors at function literal site.

test/cctest/test-code-stub-assembler.cc

 // Copyright 2015 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/base/utils/random-number-generator.h"
 #include "src/builtins/builtins-promise.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/compiler/node.h"
 #include "src/isolate.h"
@@ skipping 2098 matching lines @@
   Handle<Code> code = data.GenerateCode();
   CHECK(!code.is_null());
 
   FunctionTester ft(code, kNumParams);
   Handle<Object> result_obj =
       ft.Call(isolate->factory()->undefined_value()).ToHandleChecked();
   CHECK(result_obj->IsJSFunction());
   Handle<JSFunction> fun = Handle<JSFunction>::cast(result_obj);
   CHECK_EQ(isolate->heap()->empty_fixed_array(), fun->properties());
   CHECK_EQ(isolate->heap()->empty_fixed_array(), fun->elements());
-  CHECK_EQ(isolate->heap()->empty_type_feedback_vector(),
-           fun->feedback_vector());
+  CHECK_EQ(isolate->heap()->undefined_cell(), fun->feedback_vector_cell());
   CHECK_EQ(isolate->heap()->the_hole_value(), fun->prototype_or_initial_map());
   CHECK_EQ(*isolate->promise_resolve_shared_fun(), fun->shared());
   CHECK_EQ(isolate->promise_resolve_shared_fun()->code(), fun->code());
   CHECK_EQ(isolate->heap()->undefined_value(), fun->next_function_link());
 }
 
 TEST(CreatePromiseGetCapabilitiesExecutorContext) {
   Isolate* isolate(CcTest::InitIsolateOnce());
 
   const int kNumParams = 1;
@@ skipping 325 matching lines @@
   m.Return(m.SmiConstant(0));
 
   Handle<Code> code = data.GenerateCode();
   CHECK(!code.is_null());
   FunctionTester ft(code, kNumParams);
   CHECK_EQ(1, Handle<Smi>::cast(ft.Call().ToHandleChecked())->value());
 }
 
 }  // namespace internal
 }  // namespace v8