[builtins] Add String.prototype.indexOf fast path in TF

src/code-factory.h

Index: src/code-factory.h
diff --git a/src/code-factory.h b/src/code-factory.h
index 23f274ea40b387a50fad26faab047009a7c64368..542f5a6e4e9ad469ffc13e0c4137aaf9605e9a9e 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -127,6 +127,7 @@ class V8_EXPORT_PRIVATE CodeFactory final {
   static Callable StringGreaterThan(Isolate* isolate);
   static Callable StringGreaterThanOrEqual(Isolate* isolate);
   static Callable SubString(Isolate* isolate);
+  static Callable StringIndexOf(Isolate* isolate);
 
   static Callable ClassOf(Isolate* isolate);
   static Callable Typeof(Isolate* isolate);