[es6] implement destructuring assignment

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/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
@@ skipping 3039 matching lines @@
   return info()->language_mode();
 }
 
 
 VectorSlotPair AstGraphBuilder::CreateVectorSlotPair(
     FeedbackVectorSlot slot) const {
   return VectorSlotPair(handle(info()->shared_info()->feedback_vector()), slot);
 }
 
 
+void AstGraphBuilder::VisitRewritableExpression(RewritableExpression* node) {
+  Visit(node->expression());
+}
+
+
 namespace {
 
 // Limit of context chain length to which inline check is possible.
 const int kMaxCheckDepth = 30;
 
 // Sentinel for {TryLoadDynamicVariable} disabling inline checks.
 const uint32_t kFullCheckRequired = -1;
 
 }  // namespace
 
@@ skipping 1234 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8