Revert of [TypeFeedbackVector] Root literal arrays in function literals slots

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index ffb786de0c4b8b370c89b3f4f9180cf397a8c6ef..376e898ea9c27f4bb78e91590bb27f7a292334bd 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -3494,16 +3494,12 @@
   return reinterpret_cast<LiteralsArray*>(object);
 }
 
-bool LiteralsArray::needs_feedback_vector() const {
-  return get(kVectorIndex)->IsUndefined(this->GetIsolate());
-}
 
 TypeFeedbackVector* LiteralsArray::feedback_vector() const {
-  if (length() == 0 || needs_feedback_vector()) {
+  if (length() == 0) {
     return TypeFeedbackVector::cast(
-        this->GetIsolate()->heap()->empty_type_feedback_vector());
-  }
-
+        const_cast<FixedArray*>(FixedArray::cast(this)));
+  }
   return TypeFeedbackVector::cast(get(kVectorIndex));
 }
 
@@ -6630,13 +6626,6 @@
   }
 }
 
-bool JSFunction::needs_literals_array() const {
-  SharedFunctionInfo* shared = this->shared();
-
-  return literals() == shared->GetIsolate()->heap()->empty_literals_array() &&
-         (shared->feedback_metadata()->slot_count() > 0 ||
-          shared->num_literals() > 0);
-}
 
 Context* JSFunction::context() {
   return Context::cast(READ_FIELD(this, kContextOffset));