Lazily compute boundfunction .name and .length if possible

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 99f80ed37b04624790c4cbdf0087dc73fea7ca7a..4bfbc780bbb4b0995d8d5171bc516a12cc7e2806 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1960,13 +1960,9 @@ MaybeHandle<JSBoundFunction> Factory::NewJSBoundFunction(
   }
 
   // Setup the map for the JSBoundFunction instance.
-  Handle<Map> map = handle(
-      target_function->IsConstructor()
-          ? isolate()->native_context()->bound_function_with_constructor_map()
-          : isolate()
-                ->native_context()
-                ->bound_function_without_constructor_map(),
-      isolate());
+  Handle<Map> map = target_function->IsConstructor()
+                        ? isolate()->bound_function_with_constructor_map()
+                        : isolate()->bound_function_without_constructor_map();
   if (map->prototype() != *prototype) {
     map = Map::TransitionToPrototype(map, prototype, REGULAR_PROTOTYPE);
   }
@@ -1978,8 +1974,6 @@ MaybeHandle<JSBoundFunction> Factory::NewJSBoundFunction(
   result->set_bound_target_function(*target_function);
   result->set_bound_this(*bound_this);
   result->set_bound_arguments(*bound_arguments);
-  result->set_length(Smi::FromInt(0));
-  result->set_name(*undefined_value(), SKIP_WRITE_BARRIER);
   return result;
 }