[turbofan] Add support for accessor inlining.

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 37 matching lines @@
   ElementsKind elements_kind_;
   MaybeHandle<JSObject> holder_;
   MapList receiver_maps_;
   MapTransitionList transitions_;
 };
 
 // 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 };
+  enum Kind {
+    kInvalid,
+    kNotFound,
+    kDataConstant,
+    kDataField,
+    kAccessorConstant
+  };
 
   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, Type* field_type,
       MaybeHandle<JSObject> holder = MaybeHandle<JSObject>(),
       MaybeHandle<Map> transition_map = MaybeHandle<Map>());
+  static PropertyAccessInfo AccessorConstant(MapList const& receiver_maps,
+                                             Handle<Object> constant,
+                                             MaybeHandle<JSObject> holder);
 
   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 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_; }
   MapList const& receiver_maps() const { return receiver_maps_; }
 
  private:
   PropertyAccessInfo(MaybeHandle<JSObject> holder,
                      MapList const& receiver_maps);
-  PropertyAccessInfo(MaybeHandle<JSObject> holder, Handle<Object> constant,
-                     MapList const& receiver_maps);
+  PropertyAccessInfo(Kind kind, MaybeHandle<JSObject> holder,
+                     Handle<Object> constant, MapList const& receiver_maps);
   PropertyAccessInfo(MaybeHandle<JSObject> holder,
                      MaybeHandle<Map> transition_map, FieldIndex field_index,
                      Type* field_type, MapList const& receiver_maps);
 
   Kind kind_;
   MapList receiver_maps_;
   Handle<Object> constant_;
   MaybeHandle<Map> transition_map_;
   MaybeHandle<JSObject> holder_;
   FieldIndex field_index_;
@@ skipping 39 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(AccessInfoFactory);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ACCESS_INFO_H_