[es6] Implement spec compliant ToName (actually ToPropertyKey).

src/full-codegen/full-codegen.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/ast.h"
 #include "src/ast-numbering.h"
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
 #include "src/debug/debug.h"
@@ skipping 865 matching lines @@
   while (current != NULL) {
     current = current->Exit(&stack_depth, &context_length);
   }
   __ Drop(stack_depth);
 }
 
 
 void FullCodeGenerator::EmitPropertyKey(ObjectLiteralProperty* property,
                                         BailoutId bailout_id) {
   VisitForStackValue(property->key());
-  __ InvokeBuiltin(Context::TO_NAME_BUILTIN_INDEX, CALL_FUNCTION);
+  __ CallRuntime(Runtime::kToName, 1);
   PrepareForBailoutForId(bailout_id, NO_REGISTERS);
   __ Push(result_register());
 }
 
 
 void FullCodeGenerator::EmitLoadSuperConstructor(SuperCallReference* ref) {
   VisitForStackValue(ref->this_function_var());
   __ CallRuntime(Runtime::kGetPrototype, 1);
 }
 
@@ skipping 691 matching lines @@
   codegen_->PrepareForBailoutForId(exit_id_, NO_REGISTERS);
   codegen_->scope_ = saved_scope_;
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8