[turbofan]: Convert StringFromCharCode to var-args style TF builtin

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index d7c48274afab16db50fad7cb0917e819fd17cc5f..d85fd6312aa4fdbe97b0641c16963b605ac6ac78 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -203,6 +203,12 @@ Callable CodeFactory::RegExpExec(Isolate* isolate) {
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
 }
 
+// static
+Callable CodeFactory::StringFromCharCode(Isolate* isolate) {
+  Handle<Code> code(isolate->builtins()->StringFromCharCode());
+  return Callable(code, BuiltinDescriptor(isolate));
+}
+
 #define DECLARE_TFS(Name, Kind, Extra, InterfaceDescriptor) \
   typedef InterfaceDescriptor##Descriptor Name##Descriptor;
 BUILTIN_LIST(IGNORE_BUILTIN, IGNORE_BUILTIN, IGNORE_BUILTIN, DECLARE_TFS,