[es6] implement destructuring assignment

src/typing-asm.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/v8.h"
 
 #include "src/typing-asm.h"
 
 #include "src/ast.h"
 #include "src/codegen.h"
@@ skipping 559 matching lines @@
       FAIL(value, "array component expected to be a function");
     }
     elem_type = Type::Union(elem_type, computed_type_, zone());
   }
   array_size_ = values->length();
   IntersectResult(expr, Type::Array(elem_type, zone()));
 }
 
 
 void AsmTyper::VisitAssignment(Assignment* expr) {
+  RETURN_IF_VISIT_NODE(expr->destructuring_assignment());
+
   // Handle function tables and everything else in different passes.
   if (!in_function_) {
     if (expr->value()->IsArrayLiteral()) {
       if (!building_function_tables_) {
         return;
       }
     } else {
       if (building_function_tables_) {
         return;
       }
@@ skipping 616 matching lines @@
     computed_type_->Print();
     PrintF("Expected type: ");
     expected_type_->Print();
 #endif
     FAIL(expr, msg);
   }
   expected_type_ = save;
 }
 }  // namespace internal
 }  // namespace v8