[runtime] Port simple String.prototype.indexOf cases to TF Builtin

src/builtins/builtins-promise.cc

 // Copyright 2016 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.
 
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 
 #include "src/promise-utils.h"
 
 namespace v8 {
@@ skipping 48 matching lines @@
   return isolate->heap()->undefined_value();
 }
 
 // ES#sec-createresolvingfunctions
 // CreateResolvingFunctions ( promise )
 BUILTIN(CreateResolvingFunctions) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
 
   Handle<JSObject> promise = args.at<JSObject>(1);
-  Handle<Object> debug_event = args.at<Object>(2);
+  Handle<Object> debug_event = args.at(2);
   Handle<JSFunction> resolve, reject;
 
   PromiseUtils::CreateResolvingFunctions(isolate, promise, debug_event,
                                          &resolve, &reject);
 
   Handle<FixedArray> result = isolate->factory()->NewFixedArray(2);
   result->set(0, *resolve);
   result->set(1, *reject);
 
   return *isolate->factory()->NewJSArrayWithElements(result, FAST_ELEMENTS, 2,
                                                      NOT_TENURED);
 }
 
 }  // namespace internal
 }  // namespace v8