Change all V8 internal private symbols to be private own symbols.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 8c103dd23d42d6eced6f9c2c668329c9899a43ae..1cc646e14465620e244101a2470d45dfa23193fa 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2861,17 +2861,17 @@ void Heap::CreateInitialObjects() {
   // Number of queued microtasks stored in Isolate::pending_microtask_count().
   set_microtask_queue(empty_fixed_array());
 
-  set_detailed_stack_trace_symbol(*factory->NewPrivateSymbol());
-  set_elements_transition_symbol(*factory->NewPrivateSymbol());
-  set_frozen_symbol(*factory->NewPrivateSymbol());
-  set_megamorphic_symbol(*factory->NewPrivateSymbol());
-  set_premonomorphic_symbol(*factory->NewPrivateSymbol());
-  set_generic_symbol(*factory->NewPrivateSymbol());
-  set_nonexistent_symbol(*factory->NewPrivateSymbol());
-  set_normal_ic_symbol(*factory->NewPrivateSymbol());
-  set_observed_symbol(*factory->NewPrivateSymbol());
-  set_stack_trace_symbol(*factory->NewPrivateSymbol());
-  set_uninitialized_symbol(*factory->NewPrivateSymbol());
+  set_detailed_stack_trace_symbol(*factory->NewPrivateOwnSymbol());
+  set_elements_transition_symbol(*factory->NewPrivateOwnSymbol());
+  set_frozen_symbol(*factory->NewPrivateOwnSymbol());
+  set_megamorphic_symbol(*factory->NewPrivateOwnSymbol());
+  set_premonomorphic_symbol(*factory->NewPrivateOwnSymbol());
+  set_generic_symbol(*factory->NewPrivateOwnSymbol());
+  set_nonexistent_symbol(*factory->NewPrivateOwnSymbol());
+  set_normal_ic_symbol(*factory->NewPrivateOwnSymbol());
+  set_observed_symbol(*factory->NewPrivateOwnSymbol());
+  set_stack_trace_symbol(*factory->NewPrivateOwnSymbol());
+  set_uninitialized_symbol(*factory->NewPrivateOwnSymbol());
   set_home_object_symbol(*factory->NewPrivateOwnSymbol());
 
   Handle<SeededNumberDictionary> slow_element_dictionary =