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

src/code-factory.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CODE_FACTORY_H_
 #define V8_CODE_FACTORY_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 47 matching lines @@
   static Callable CompareNilIC(Isolate* isolate, NilValue nil_value);
 
   static Callable BinaryOpIC(Isolate* isolate, Token::Value op);
 
   static Callable ApiGetter(Isolate* isolate);
 
   // Code stubs. Add methods here as needed to reduce dependency on
   // code-stubs.h.
   static Callable InstanceOf(Isolate* isolate);
 
+  static Callable StringFromCharCode(Isolate* isolate);
+
   static Callable GetProperty(Isolate* isolate);
 
   static Callable ToBoolean(Isolate* isolate);
 
   static Callable ToNumber(Isolate* isolate);
   static Callable NonNumberToNumber(Isolate* isolate);
   static Callable StringToNumber(Isolate* isolate);
   static Callable ToString(Isolate* isolate);
   static Callable ToName(Isolate* isolate);
   static Callable ToInteger(Isolate* isolate);
@@ skipping 84 matching lines @@
       Isolate* isolate, CallableType function_type = CallableType::kAny);
   static Callable InterpreterPushArgsAndConstructArray(Isolate* isolate);
   static Callable InterpreterCEntry(Isolate* isolate, int result_size = 1);
   static Callable InterpreterOnStackReplacement(Isolate* isolate);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_FACTORY_H_