[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 ab652964c65fdf5c43422c760318529aa075b53d..8a4fa4985ee322848e5146900b3bdde577ef0ce2 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -338,6 +338,12 @@ Callable CodeFactory::StringGreaterThanOrEqual(Isolate* isolate) {
 }
 
 // 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());