[turbofan] Use FastNewClosureStub if possible.

src/code-factory.h

Index: src/code-factory.h
diff --git a/src/code-factory.h b/src/code-factory.h
index 858cfbafa25415129880732113f758730fc138c2..16ef6d5ffe42260a6b219f2407ee3ef6c223aa71 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -69,6 +69,9 @@ class CodeFactory final {
   static Callable FastCloneShallowArray(Isolate* isolate);
   static Callable FastCloneShallowObject(Isolate* isolate, int length);
 
+  static Callable FastNewClosure(Isolate* isolate, LanguageMode language_mode,
+                                 FunctionKind kind);
+
   static Callable AllocateHeapNumber(Isolate* isolate);
 
   static Callable CallFunction(Isolate* isolate, int argc,