[turbofan] Merge PropertyAccessInfo for compatible field loads.

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 65 matching lines @@
       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);
 
   PropertyAccessInfo();
 
-  bool Merge(PropertyAccessInfo const* that) WARN_UNUSED_RESULT;
+  bool Merge(PropertyAccessInfo const* that, AccessMode access_mode,
+             Zone* zone) WARN_UNUSED_RESULT;
 
   bool IsNotFound() const { return kind() == kNotFound; }
   bool IsDataConstant() const { return kind() == kDataConstant; }
   bool IsDataField() const { return kind() == kDataField; }
   // TODO(ishell): rename to IsDataConstant() once constant field tracking
   // is done.
   bool IsDataConstantField() const { return kind() == kDataConstantField; }
   bool IsAccessorConstant() const { return kind() == kAccessorConstant; }
 
   bool HasTransitionMap() const { return !transition_map().is_null(); }
@@ skipping 71 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(AccessInfoFactory);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ACCESS_INFO_H_