[LookupIterator] Avoid additional descriptor lookup in TransitionToAccessorProperty

test/cctest/test-field-type-tracking.cc

 // 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.
 
 #include <stdlib.h>
 #include <utility>
 
 #include "test/cctest/test-api.h"
 
 #include "src/v8.h"
@@ skipping 381 matching lines @@
     CHECK_EQ(number_of_properties_, map->NumberOfOwnDescriptors());
     int property_index = number_of_properties_++;
     SetAccessorConstant(property_index, attributes, pair);
 
     Handle<String> name = MakeName("prop", property_index);
 
     Isolate* isolate = CcTest::i_isolate();
     Handle<Object> getter(pair->getter(), isolate);
     Handle<Object> setter(pair->setter(), isolate);
 
-    map = Map::TransitionToAccessorProperty(map, name, ACCESSOR_GETTER, getter,
-                                            attributes);
+    int descriptor =
+        map->instance_descriptors()->SearchWithCache(isolate, *name, *map);
+    map = Map::TransitionToAccessorProperty(
+        map, name, descriptor, ACCESSOR_GETTER, getter, attributes);
     CHECK(!map->is_deprecated());
     CHECK(!map->is_dictionary_map());
 
-    map = Map::TransitionToAccessorProperty(map, name, ACCESSOR_SETTER, setter,
-                                            attributes);
+    descriptor =
+        map->instance_descriptors()->SearchWithCache(isolate, *name, *map);
+    map = Map::TransitionToAccessorProperty(
+        map, name, descriptor, ACCESSOR_SETTER, setter, attributes);
     CHECK(!map->is_deprecated());
     CHECK(!map->is_dictionary_map());
     return map;
   }
 };
 
 
 ////////////////////////////////////////////////////////////////////////////////
 // A set of tests for property reconfiguration that makes new transition tree
 // branch.
@@ skipping 1756 matching lines @@
   Handle<AccessorPair> pair = CreateAccessorPair(true, true);
   TransitionToAccessorConstantOperator transition_op(pair);
 
   SameMapChecker checker;
   TestTransitionTo(transition_op, transition_op, checker);
 }
 
 
 // TODO(ishell): add this test once IS_ACCESSOR_FIELD_SUPPORTED is supported.
 // TEST(TransitionAccessorConstantToAnotherAccessorConstant)