Allow for creating Private API symbols that have a number as an ID

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 6b6f80f795debf708f1882772eea5a3ade12dd98..17792341eac5a9955ec497dae1023bab46a3c31d 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -6996,7 +6996,7 @@ static i::Handle<i::Symbol> SymbolFor(i::Isolate* isolate,
     else
       symbol = isolate->factory()->NewSymbol();
     i::Handle<i::Symbol>::cast(symbol)->set_name(*name);
-    i::JSObject::SetProperty(symbols, name, symbol, i::STRICT).Assert();
+    i::Object::SetPropertyOrElement(symbols, name, symbol, i::STRICT).Assert();
   }
   return i::Handle<i::Symbol>::cast(symbol);
 }