[ic] Use UnseededNumberDictionary as a storage for names in TypeFeedbackMetadata.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 646552810095c77a0fc430d8e82486dafaeaa1a8..8a97b2d7852ee628af7ae2da45d9acc53981f1ee 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -16189,7 +16189,7 @@ Handle<Derived> HashTable<Derived, Shape, Key>::New(
   Factory* factory = isolate->factory();
   int length = EntryToIndex(capacity);
   Handle<FixedArray> array = factory->NewFixedArray(length, pretenure);
-  array->set_map_no_write_barrier(*factory->hash_table_map());
+  array->set_map_no_write_barrier(Shape::GetMap(isolate));
   Handle<Derived> table = Handle<Derived>::cast(array);
 
   table->SetNumberOfElements(0);