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

src/runtime/runtime-regexp.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/conversions-inl.h"
 #include "src/isolate-inl.h"
 #include "src/messages.h"
@@ skipping 1260 matching lines @@
 
 // Slow path for:
 // ES#sec-regexp.prototype-@@replace
 // RegExp.prototype [ @@replace ] ( string, replaceValue )
 RUNTIME_FUNCTION(Runtime_RegExpReplace) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
 
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, recv, 0);
   CONVERT_ARG_HANDLE_CHECKED(String, string, 1);
-  Handle<Object> replace_obj = args.at<Object>(2);
+  Handle<Object> replace_obj = args.at(2);
 
   Factory* factory = isolate->factory();
 
   string = String::Flatten(string);
 
   // Fast-path for unmodified JSRegExps.
   if (RegExpUtils::IsUnmodifiedRegExp(isolate, recv)) {
     RETURN_RESULT_OR_FAILURE(
         isolate, RegExpReplace(isolate, Handle<JSRegExp>::cast(recv), string,
                                replace_obj));
@@ skipping 159 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_IsRegExp) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   return isolate->heap()->ToBoolean(obj->IsJSRegExp());
 }
 
 }  // namespace internal
 }  // namespace v8