[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/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/linkage.h"
@@ skipping 2047 matching lines @@
       Node* store = BuildKeyedSuperStore(receiver, home_object, key, value);
       states.AddToNode(store, bailout_id_after,
                        OutputFrameStateCombine::Ignore());
       break;
     }
   }
 }
 
 
 void AstGraphBuilder::VisitAssignment(Assignment* expr) {
+  RETURN_IF_VISIT_NODE(expr->destructuring_assignment());
   DCHECK(expr->target()->IsValidReferenceExpressionOrThis());
 
   // Left-hand side can only be a property, a global or a variable slot.
   Property* property = expr->target()->AsProperty();
   LhsKind assign_type = Property::GetAssignType(property);
   bool needs_frame_state_before = true;
 
   // Evaluate LHS expression.
   switch (assign_type) {
     case VARIABLE: {
@@ skipping 2232 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