[es6] Use strict arguments objects for destructured parameters

src/scopes.h

 // Copyright 2012 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.
 
 #ifndef V8_SCOPES_H_
 #define V8_SCOPES_H_
 
 #include "src/ast.h"
 #include "src/pending-compilation-error-handler.h"
 #include "src/zone.h"
@@ skipping 371 matching lines @@
   Variable* rest_parameter(int* index) const {
     *index = rest_index_;
     if (rest_index_ < 0) return NULL;
     return rest_parameter_;
   }
 
   bool has_rest_parameter() const {
     return rest_index_ >= 0;
   }
 
-  bool is_simple_parameter_list() const {
+  bool has_simple_parameters() const {
     DCHECK(is_function_scope());
-    if (rest_index_ >= 0) return false;
-    return true;
+    return has_simple_parameters_;
   }
 
   // The local variable 'arguments' if we need to allocate it; NULL otherwise.
   Variable* arguments() const {
     DCHECK(!is_arrow_scope() || arguments_ == nullptr);
     return arguments_;
   }
 
   Variable* this_function_var() const {
     // This is only used in derived constructors atm.
@@ skipping 219 matching lines @@
   int num_stack_slots_;
   int num_heap_slots_;
   int num_global_slots_;
 
   // The number of modules (including nested ones).
   int num_modules_;
 
   // For module scopes, the host scope's temporary variable binding this module.
   Variable* module_var_;
 
-  // Rest parameter
+  // Info about the parameter list of a function.
+  bool has_simple_parameters_;
   Variable* rest_parameter_;
   int rest_index_;
 
   // Serialized scope info support.
   Handle<ScopeInfo> scope_info_;
   bool already_resolved() { return already_resolved_; }
 
   // Create a non-local variable with a given name.
   // These variables are looked up dynamically at runtime.
   Variable* NonLocal(const AstRawString* name, VariableMode mode);
@@ skipping 119 matching lines @@
   PendingCompilationErrorHandler pending_error_handler_;
 
   // For tracking which classes are declared consecutively. Needed for strong
   // mode.
   int class_declaration_group_start_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_