Fix issue with __proto__ when using ES6 object literals

src/compiler/ast-graph-builder.cc

 // Copyright 2014 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/compiler/ast-graph-builder.h"
 
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 884 matching lines @@
     environment()->Push(property->is_static() ? literal : proto);
 
     VisitForValue(property->key());
     VisitForValue(property->value());
     Node* value = environment()->Pop();
     Node* key = environment()->Pop();
     Node* receiver = environment()->Pop();
     switch (property->kind()) {
       case ObjectLiteral::Property::CONSTANT:
       case ObjectLiteral::Property::MATERIALIZED_LITERAL:
+      case ObjectLiteral::Property::PROTOTYPE:
         UNREACHABLE();
-      case ObjectLiteral::Property::COMPUTED:
-      case ObjectLiteral::Property::PROTOTYPE: {
+      case ObjectLiteral::Property::COMPUTED: {
         const Operator* op =
             javascript()->CallRuntime(Runtime::kDefineClassMethod, 3);
         NewNode(op, receiver, key, value);
         break;
       }
       case ObjectLiteral::Property::GETTER: {
         const Operator* op = javascript()->CallRuntime(
             Runtime::kDefineGetterPropertyUnchecked, 3);
         NewNode(op, receiver, key, value);
         break;
@@ skipping 1439 matching lines @@
 
 BitVector* AstGraphBuilder::GetVariablesAssignedInLoop(
     IterationStatement* stmt) {
   if (loop_assignment_analysis_ == NULL) return NULL;
   return loop_assignment_analysis_->GetVariablesAssignedInLoop(stmt);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8