Remove the global Strength enum class completely.

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index 67bc62e7e2c9d16c8c69f32741dd170263a5ad2c..17422e8f21a08fb7d91ffa95f37f0a16b50c3a79 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -466,7 +466,6 @@ void Map::MapPrint(std::ostream& os) {  // NOLINT
   if (is_access_check_needed()) os << "\n - access_check_needed";
   if (!is_extensible()) os << "\n - non-extensible";
   if (is_observed()) os << "\n - observed";
-  if (is_strong()) os << "\n - strong_map";
   if (is_prototype_map()) {
     os << "\n - prototype_map";
     os << "\n - prototype info: " << Brief(prototype_info());