[runtime] Add MapUpdater class that manages all kinds of map updates.

src/value-serializer.cc

 // Copyright 2016 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.
 
 #include "src/value-serializer.h"
 
 #include <type_traits>
 
 #include "src/base/logging.h"
 #include "src/conversions.h"
@@ skipping 1646 matching lines @@
         PropertyDetails details =
             target->instance_descriptors()->GetDetails(descriptor);
         Representation expected_representation = details.representation();
         if (value->FitsRepresentation(expected_representation)) {
           if (expected_representation.IsHeapObject() &&
               !target->instance_descriptors()
                    ->GetFieldType(descriptor)
                    ->NowContains(value)) {
             Handle<FieldType> value_type =
                 value->OptimalType(isolate_, expected_representation);
-            Map::GeneralizeFieldType(target, descriptor,
-                                     expected_representation, value_type);
+            Map::GeneralizeField(target, descriptor, expected_representation,
+                                 value_type);
           }
           DCHECK(target->instance_descriptors()
                      ->GetFieldType(descriptor)
                      ->NowContains(value));
           properties.push_back(value);
           map = target;
           continue;
         } else {
           transitioning = false;
         }
@@ skipping 191 matching lines @@
   if (stack.size() != 1) {
     isolate_->Throw(*isolate_->factory()->NewError(
         MessageTemplate::kDataCloneDeserializationError));
     return MaybeHandle<Object>();
   }
   return scope.CloseAndEscape(stack[0]);
 }
 
 }  // namespace internal
 }  // namespace v8