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

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 0ff6defa05a675ad6e71f7114567a8e0f4bf7389..d1dcc9a28817cae1c46037ad557b65786b3861fa 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -294,6 +294,12 @@ Callable CodeFactory::StringCompare(Isolate* isolate, Token::Value token) {
 }
 
 // static
+Callable CodeFactory::StringIndexOf(Isolate* isolate) {
+  return Callable(isolate->builtins()->StringIndexOf(),
+                  StringIndexOfDescriptor(isolate));
+}
+
+// static
 Callable CodeFactory::SubString(Isolate* isolate) {
   SubStringStub stub(isolate);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());