[runtime] Add %ToString and %_ToString and remove the TO_STRING builtin.

src/interface-descriptors.cc

 // Copyright 2012 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/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
@@ skipping 144 matching lines @@
 }
 
 
 void InstanceOfDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {LeftRegister(), RightRegister()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 
+void ToStringDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {ReceiverRegister()};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 void ToObjectDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {ReceiverRegister()};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 
 void MathPowTaggedDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {exponent()};
@@ skipping 265 matching lines @@
       AnyTagged(), Type::Undefined(), 5, isolate->interface_descriptor_zone());
   function->InitParameter(0, Type::Receiver());
   function->InitParameter(1, SmiType());
   function->InitParameter(2, AnyTagged());
   function->InitParameter(3, AnyTagged());
   function->InitParameter(4, AnyTagged());
   return function;
 }
 }  // namespace internal
 }  // namespace v8