[es6] implement destructuring assignment

src/compiler/ast-loop-assignment-analyzer.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-loop-assignment-analyzer.h"
 #include "src/compiler.h"
 #include "src/parser.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 120 matching lines @@
 }
 
 
 void ALAA::VisitConditional(Conditional* e) {
   Visit(e->condition());
   Visit(e->then_expression());
   Visit(e->else_expression());
 }
 
 
+void ALAA::VisitAssignmentPattern(AssignmentPattern* e) {
+  Visit(e->expression());
+}
+
+
 void ALAA::VisitObjectLiteral(ObjectLiteral* e) {
   ZoneList<ObjectLiteralProperty*>* properties = e->properties();
   for (int i = 0; i < properties->length(); i++) {
     Visit(properties->at(i)->value());
   }
 }
 
 
 void ALAA::VisitArrayLiteral(ArrayLiteral* e) { VisitExpressions(e->values()); }
 
@@ skipping 155 matching lines @@
   int count = 0;
   int var_index = AstLoopAssignmentAnalyzer::GetVariableIndex(scope, var);
   for (size_t i = 0; i < list_.size(); i++) {
     if (list_[i].second->Contains(var_index)) count++;
   }
   return count;
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8