[turbofan] Add support for transitioning stores to double fields.

src/compiler/property-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_PROPERTY_ACCESS_INFO_H_
 #define V8_COMPILER_PROPERTY_ACCESS_INFO_H_
 
 #include <iosfwd>
 
 #include "src/field-index.h"
@@ skipping 42 matching lines @@
   bool IsDataField() const { return kind() == kDataField; }
 
   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_; }
   Type* receiver_type() const { return receiver_type_; }
 
+  bool HasTransitionMap() const { return !transition_map().is_null(); }
+
  private:
   PropertyAccessInfo(MaybeHandle<JSObject> holder, Handle<Object> constant,
                      Type* receiver_type);
   PropertyAccessInfo(MaybeHandle<JSObject> holder,
                      MaybeHandle<Map> transition_map, FieldIndex field_index,
                      Type* field_type, Type* receiver_type);
 
   Kind kind_;
   Type* receiver_type_;
   Handle<Object> constant_;
@@ skipping 11 matching lines @@
                             Handle<Context> native_context, Zone* zone);
 
   bool ComputePropertyAccessInfo(Handle<Map> map, Handle<Name> name,
                                  PropertyAccessMode access_mode,
                                  PropertyAccessInfo* access_info);
   bool ComputePropertyAccessInfos(MapHandleList const& maps, Handle<Name> name,
                                   PropertyAccessMode access_mode,
                                   ZoneVector<PropertyAccessInfo>* access_infos);
 
  private:
+  bool LookupSpecialFieldAccessor(Handle<Map> map, Handle<Name> name,
+                                  PropertyAccessInfo* access_info);
+  bool LookupTransition(Handle<Map> map, Handle<Name> name,
+                        MaybeHandle<JSObject> holder,
+                        PropertyAccessInfo* access_info);
+
   CompilationDependencies* dependencies() const { return dependencies_; }
   Factory* factory() const;
   Isolate* isolate() const { return isolate_; }
   Handle<Context> native_context() const { return native_context_; }
   Zone* zone() const { return zone_; }
 
   CompilationDependencies* const dependencies_;
   Handle<Context> const native_context_;
   Isolate* const isolate_;
   TypeCache const& type_cache_;
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(PropertyAccessInfoFactory);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_PROPERTY_ACCESS_INFO_H_