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

src/runtime/runtime-proxy.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/elements.h"
 #include "src/factory.h"
 #include "src/isolate-inl.h"
@@ skipping 26 matching lines @@
   Handle<Object> trap;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, trap,
       Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name));
   // 6. If trap is undefined, then
   int const arguments_length = args.length() - 2;
   if (trap->IsUndefined(isolate)) {
     // 6.a. Return Call(target, thisArgument, argumentsList).
     ScopedVector<Handle<Object>> argv(arguments_length);
     for (int i = 0; i < arguments_length; ++i) {
-      argv[i] = args.at<Object>(i + 1);
+      argv[i] = args.at(i + 1);
     }
     RETURN_RESULT_OR_FAILURE(
         isolate, Execution::Call(isolate, target, receiver, arguments_length,
                                  argv.start()));
   }
   // 7. Let argArray be CreateArrayFromList(argumentsList).
   Handle<JSArray> arg_array = isolate->factory()->NewJSArray(
       FAST_ELEMENTS, arguments_length, arguments_length);
   ElementsAccessor* accessor = arg_array->GetElementsAccessor();
   {
@@ skipping 35 matching lines @@
       isolate, trap,
       Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name));
   // 6. If trap is undefined, then
   int const arguments_length = args.length() - 3;
   if (trap->IsUndefined(isolate)) {
     // 6.a. Assert: target has a [[Construct]] internal method.
     DCHECK(target->IsConstructor());
     // 6.b. Return Construct(target, argumentsList, newTarget).
     ScopedVector<Handle<Object>> argv(arguments_length);
     for (int i = 0; i < arguments_length; ++i) {
-      argv[i] = args.at<Object>(i + 1);
+      argv[i] = args.at(i + 1);
     }
     RETURN_RESULT_OR_FAILURE(
         isolate, Execution::New(isolate, target, new_target, arguments_length,
                                 argv.start()));
   }
   // 7. Let argArray be CreateArrayFromList(argumentsList).
   Handle<JSArray> arg_array = isolate->factory()->NewJSArray(
       FAST_ELEMENTS, arguments_length, arguments_length);
   ElementsAccessor* accessor = arg_array->GetElementsAccessor();
   {
@@ skipping 46 matching lines @@
 RUNTIME_FUNCTION(Runtime_JSProxyRevoke) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSProxy, proxy, 0);
   JSProxy::Revoke(proxy);
   return isolate->heap()->undefined_value();
 }
 
 }  // namespace internal
 }  // namespace v8