[es6] implement destructuring assignment

src/interpreter/bytecode-generator.cc

 // Copyright 2015 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/interpreter/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/interpreter/control-flow-builders.h"
 #include "src/objects.h"
@@ skipping 2018 matching lines @@
     BytecodeLabel end_label;
     VisitForAccumulatorValue(left);
     builder()->JumpIfFalse(&end_label);
     VisitForAccumulatorValue(right);
     builder()->Bind(&end_label);
   }
   execution_result()->SetResultInAccumulator();
 }
 
 
+void BytecodeGenerator::VisitRewritableExpression(RewritableExpression* expr) {
+  Visit(expr->expression());
+}
+
+
 void BytecodeGenerator::VisitNewLocalFunctionContext() {
   AccumulatorResultScope accumulator_execution_result(this);
   Scope* scope = this->scope();
 
   // Allocate a new local context.
   if (scope->is_script_scope()) {
     TemporaryRegisterScope temporary_register_scope(builder());
     Register closure = temporary_register_scope.NewRegister();
     Register scope_info = temporary_register_scope.NewRegister();
     DCHECK(Register::AreContiguous(closure, scope_info));
@@ skipping 183 matching lines @@
 }
 
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return info()->feedback_vector()->GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8