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

src/builtins/builtins-function.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.h"
 #include "src/builtins/builtins-utils.h"
 
 #include "src/compiler.h"
 #include "src/string-builder.h"
 
@@ skipping 24 matching lines @@
     IncrementalStringBuilder builder(isolate);
     builder.AppendCharacter('(');
     builder.AppendCString(token);
     builder.AppendCharacter('(');
     bool parenthesis_in_arg_string = false;
     if (argc > 1) {
       for (int i = 1; i < argc; ++i) {
         if (i > 1) builder.AppendCharacter(',');
         Handle<String> param;
         ASSIGN_RETURN_ON_EXCEPTION(
-            isolate, param, Object::ToString(isolate, args.at<Object>(i)),
-            Object);
+            isolate, param, Object::ToString(isolate, args.at(i)), Object);
         param = String::Flatten(param);
         builder.AppendString(param);
         // If the formal parameters string include ) - an illegal
         // character - it may make the combined function expression
         // compile. We avoid this problem by checking for this early on.
         DisallowHeapAllocation no_gc;  // Ensure vectors stay valid.
         String::FlatContent param_content = param->GetFlatContent();
         for (int i = 0, length = param->length(); i < length; ++i) {
           if (param_content.Get(i) == ')') {
             parenthesis_in_arg_string = true;
             break;
           }
         }
       }
       // If the formal parameters include an unbalanced block comment, the
       // function must be rejected. Since JavaScript does not allow nested
       // comments we can include a trailing block comment to catch this.
       builder.AppendCString("\n/*``*/");
     }
     builder.AppendCString(") {\n");
     if (argc > 0) {
       Handle<String> body;
       ASSIGN_RETURN_ON_EXCEPTION(
-          isolate, body, Object::ToString(isolate, args.at<Object>(argc)),
-          Object);
+          isolate, body, Object::ToString(isolate, args.at(argc)), Object);
       builder.AppendString(body);
     }
     builder.AppendCString("\n})");
     ASSIGN_RETURN_ON_EXCEPTION(isolate, source, builder.Finish(), Object);
 
     // The SyntaxError must be thrown after all the (observable) ToString
     // conversions are done.
     if (parenthesis_in_arg_string) {
       THROW_NEW_ERROR(isolate,
                       NewSyntaxError(MessageTemplate::kParenthesisInArgString),
@@ skipping 90 matching lines @@
   if (!args.receiver()->IsCallable()) {
     THROW_NEW_ERROR_RETURN_FAILURE(
         isolate, NewTypeError(MessageTemplate::kFunctionBind));
   }
 
   // Allocate the bound function with the given {this_arg} and {args}.
   Handle<JSReceiver> target = args.at<JSReceiver>(0);
   Handle<Object> this_arg = isolate->factory()->undefined_value();
   ScopedVector<Handle<Object>> argv(std::max(0, args.length() - 2));
   if (args.length() > 1) {
-    this_arg = args.at<Object>(1);
+    this_arg = args.at(1);
     for (int i = 2; i < args.length(); ++i) {
-      argv[i - 2] = args.at<Object>(i);
+      argv[i - 2] = args.at(i);
     }
   }
   Handle<JSBoundFunction> function;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, function,
       isolate->factory()->NewJSBoundFunction(target, this_arg, argv));
 
   LookupIterator length_lookup(target, isolate->factory()->length_string(),
                                target, LookupIterator::OWN);
   // Setup the "length" property based on the "length" of the {target}.
@@ skipping 94 matching lines @@
 
   Node* f = assembler.Parameter(0);
   Node* v = assembler.Parameter(1);
   Node* context = assembler.Parameter(4);
   Node* result = assembler.OrdinaryHasInstance(context, f, v);
   assembler.Return(result);
 }
 
 }  // namespace internal
 }  // namespace v8