Link type feedback vectors to the shared function info.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index a184bf4017bbe188c0fc96840bb930d65c639006..1579d2e3f0b19ef84e0b8ace616f0122dff6783c 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -6591,12 +6591,7 @@ void JSFunction::ReplaceCode(Code* code) {
 }
 
 bool JSFunction::has_feedback_vector() const {
-  SharedFunctionInfo* shared = this->shared();
-
-  return (feedback_vector_cell()->value() !=
-              shared->GetIsolate()->heap()->empty_feedback_vector() ||
-          (shared->feedback_metadata()->slot_count() == 0 &&
-           shared->num_literals() == 0));
+  return !feedback_vector_cell()->value()->IsUndefined(GetIsolate());
 }
 
 Context* JSFunction::context() {