[runtime] Replace %to_string_fun with %_ToString.

src/parser.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/parser.h"
 
 #include "src/api.h"
 #include "src/ast.h"
 #include "src/ast-literal-reindexer.h"
 #include "src/bailout-reason.h"
@@ skipping 5900 matching lines @@
     Expression* expr = cooked_strings->at(0);
     int i = 0;
     while (i < expressions->length()) {
       Expression* sub = expressions->at(i++);
       Expression* cooked_str = cooked_strings->at(i);
 
       // Let middle be ToString(sub).
       ZoneList<Expression*>* args =
           new (zone()) ZoneList<Expression*>(1, zone());
       args->Add(sub, zone());
-      Expression* middle = factory()->NewCallRuntime(
-          Context::TO_STRING_FUN_INDEX, args, sub->position());
+      Expression* middle = factory()->NewCallRuntime(Runtime::kInlineToString,
+                                                     args, sub->position());
 
       expr = factory()->NewBinaryOperation(
           Token::ADD, factory()->NewBinaryOperation(
                           Token::ADD, expr, middle, expr->position()),
           cooked_str, sub->position());
     }
     return expr;
   } else {
     uint32_t hash = ComputeTemplateLiteralHash(lit);
 
@@ skipping 173 matching lines @@
 
 Expression* Parser::SpreadCallNew(Expression* function,
                                   ZoneList<v8::internal::Expression*>* args,
                                   int pos) {
   args->InsertAt(0, function, zone());
 
   return factory()->NewCallRuntime(Context::REFLECT_CONSTRUCT_INDEX, args, pos);
 }
 }  // namespace internal
 }  // namespace v8