[turbofan] Add support for loading missing properties.

src/compiler/js-native-context-specialization.h

 // 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.
 
 #ifndef V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_
 #define V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/property-access-info.h"
@@ skipping 46 matching lines @@
 
   Reduction Replace(Node* node, Node* value, Node* effect = nullptr,
                     Node* control = nullptr) {
     ReplaceWithValue(node, value, effect, control);
     return Changed(value);
   }
   Reduction Replace(Node* node, Handle<Object> value);
 
   Reduction ReduceNamedAccess(Node* node, Node* value,
                               MapHandleList const& receiver_maps,
-                              Handle<Name> name,
-                              PropertyAccessMode access_mode);
+                              Handle<Name> name, PropertyAccessMode access_mode,
+                              LanguageMode language_mode);
 
   struct ScriptContextTableLookupResult;
   bool LookupInScriptContextTable(Handle<Name> name,
                                   ScriptContextTableLookupResult* result);
 
   // Adds stability dependencies on all prototypes of every class in
   // {receiver_type} up to (and including) the {holder}.
   void AssumePrototypesStable(Type* receiver_type, Handle<JSObject> holder);
 
   Graph* graph() const;
@@ skipping 25 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(JSNativeContextSpecialization);
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSNativeContextSpecialization::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_