[turbofan] Introduce map-guarded generic handler for named store.

src/compiler/access-info.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_ACCESS_INFO_H_
 #define V8_COMPILER_ACCESS_INFO_H_
 
 #include <iosfwd>
 
 #include "src/field-index.h"
@@ skipping 43 matching lines @@
 
 // This class encapsulates all information required to access a certain
 // object property, either on the object itself or on the prototype chain.
 class PropertyAccessInfo final {
  public:
   enum Kind {
     kInvalid,
     kNotFound,
     kDataConstant,
     kDataField,
-    kAccessorConstant
+    kAccessorConstant,
+    kGeneric
   };
 
   static PropertyAccessInfo NotFound(MapList const& receiver_maps,
                                      MaybeHandle<JSObject> holder);
   static PropertyAccessInfo DataConstant(MapList const& receiver_maps,
                                          Handle<Object> constant,
                                          MaybeHandle<JSObject> holder);
   static PropertyAccessInfo DataField(
       MapList const& receiver_maps, FieldIndex field_index,
       MachineRepresentation field_representation, Type* field_type,
       MaybeHandle<Map> field_map = MaybeHandle<Map>(),
       MaybeHandle<JSObject> holder = MaybeHandle<JSObject>(),
       MaybeHandle<Map> transition_map = MaybeHandle<Map>());
   static PropertyAccessInfo AccessorConstant(MapList const& receiver_maps,
                                              Handle<Object> constant,
                                              MaybeHandle<JSObject> holder);
+  static PropertyAccessInfo Generic(MapList const& receiver_maps);
 
   PropertyAccessInfo();
 
   bool Merge(PropertyAccessInfo const* that) WARN_UNUSED_RESULT;
 
   bool IsNotFound() const { return kind() == kNotFound; }
   bool IsDataConstant() const { return kind() == kDataConstant; }
   bool IsDataField() const { return kind() == kDataField; }
   bool IsAccessorConstant() const { return kind() == kAccessorConstant; }
+  bool IsGeneric() const { return kind() == kGeneric; }
 
   bool HasTransitionMap() const { return !transition_map().is_null(); }
 
   Kind kind() const { return kind_; }
   MaybeHandle<JSObject> holder() const { return holder_; }
   MaybeHandle<Map> transition_map() const { return transition_map_; }
   Handle<Object> constant() const { return constant_; }
   FieldIndex field_index() const { return field_index_; }
   Type* field_type() const { return field_type_; }
   MachineRepresentation field_representation() const {
@@ skipping 63 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(AccessInfoFactory);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ACCESS_INFO_H_