[builtins] Object.prototype.toString() as TurboFan stub.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 3c00a5e09867d442b67526e32da5b6bfea3360ed..0ea29176be345506f82267babf7a996a7b44f249 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2482,7 +2482,7 @@ void Bootstrapper::ExportFromRuntime(Isolate* isolate,
     Handle<JSFunction> to_string = InstallFunction(
         container, "object_to_string", JS_OBJECT_TYPE, JSObject::kHeaderSize,
         MaybeHandle<JSObject>(), Builtins::kObjectProtoToString);
-    to_string->shared()->DontAdaptArguments();
+    to_string->shared()->set_internal_formal_parameter_count(0);
     to_string->shared()->set_length(0);
     native_context->set_object_to_string(*to_string);
   }