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

src/builtins/builtins-number.cc

Index: src/builtins/builtins-number.cc
diff --git a/src/builtins/builtins-number.cc b/src/builtins/builtins-number.cc
index 098cac92171ed8ca10efe648317af3189908bb6b..8bfbfc1d52e513e6aa8bbbb72b82888c7b1bf603 100644
--- a/src/builtins/builtins-number.cc
+++ b/src/builtins/builtins-number.cc
@@ -336,7 +336,7 @@ TF_BUILTIN(NumberParseInt, CodeStubAssembler) {
 // ES6 section 20.1.3.2 Number.prototype.toExponential ( fractionDigits )
 BUILTIN(NumberPrototypeToExponential) {
   HandleScope scope(isolate);
-  Handle<Object> value = args.at<Object>(0);
+  Handle<Object> value = args.at(0);
   Handle<Object> fraction_digits = args.atOrUndefined(isolate, 1);
 
   // Unwrap the receiver {value}.
@@ -379,7 +379,7 @@ BUILTIN(NumberPrototypeToExponential) {
 // ES6 section 20.1.3.3 Number.prototype.toFixed ( fractionDigits )
 BUILTIN(NumberPrototypeToFixed) {
   HandleScope scope(isolate);
-  Handle<Object> value = args.at<Object>(0);
+  Handle<Object> value = args.at(0);
   Handle<Object> fraction_digits = args.atOrUndefined(isolate, 1);
 
   // Unwrap the receiver {value}.
@@ -422,7 +422,7 @@ BUILTIN(NumberPrototypeToFixed) {
 // ES6 section 20.1.3.4 Number.prototype.toLocaleString ( [ r1 [ , r2 ] ] )
 BUILTIN(NumberPrototypeToLocaleString) {
   HandleScope scope(isolate);
-  Handle<Object> value = args.at<Object>(0);
+  Handle<Object> value = args.at(0);
 
   // Unwrap the receiver {value}.
   if (value->IsJSValue()) {
@@ -442,7 +442,7 @@ BUILTIN(NumberPrototypeToLocaleString) {
 // ES6 section 20.1.3.5 Number.prototype.toPrecision ( precision )
 BUILTIN(NumberPrototypeToPrecision) {
   HandleScope scope(isolate);
-  Handle<Object> value = args.at<Object>(0);
+  Handle<Object> value = args.at(0);
   Handle<Object> precision = args.atOrUndefined(isolate, 1);
 
   // Unwrap the receiver {value}.
@@ -486,7 +486,7 @@ BUILTIN(NumberPrototypeToPrecision) {
 // ES6 section 20.1.3.6 Number.prototype.toString ( [ radix ] )
 BUILTIN(NumberPrototypeToString) {
   HandleScope scope(isolate);
-  Handle<Object> value = args.at<Object>(0);
+  Handle<Object> value = args.at(0);
   Handle<Object> radix = args.atOrUndefined(isolate, 1);
 
   // Unwrap the receiver {value}.