[builtins] FastNewClosureStub becomes a builtin.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 82f19cb059e05859d346b00bc79096dcea4411d3..30aeb98d5e65fb02e2866b859b908263327305e5 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -344,7 +344,8 @@ void JSGenericLowering::LowerJSCreateClosure(Node* node) {
   Handle<SharedFunctionInfo> const shared_info = p.shared_info();
   node->InsertInput(zone(), 0, jsgraph()->HeapConstant(shared_info));
 
-  // Use the FastNewClosureStub only for functions allocated in new space.
+  // Use the FastNewClosurebuiltin only for functions allocated in new
+  // space.
   if (p.pretenure() == NOT_TENURED) {
     Callable callable = CodeFactory::FastNewClosure(isolate());
     ReplaceWithStubCall(node, callable, flags);