Revert of [runtime] Introduce maps for the likely cases of FromPropertyDescriptor.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 3edb485c0d16e3473e2d861aa5fdc86486393983..1a763b8035d1eb46a26948b516512d408eb1b3ea 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2732,89 +2732,6 @@
 
   InstallBuiltinFunctionIds();
 
-  // Create a map for accessor property descriptors (a variant of JSObject
-  // that predefines four properties get, set, configurable and enumerable).
-  {
-    // AccessorPropertyDescriptor initial map.
-    Handle<Map> map =
-        factory()->NewMap(JS_OBJECT_TYPE, JSAccessorPropertyDescriptor::kSize);
-    // Create the descriptor array for the property descriptor object.
-    Map::EnsureDescriptorSlack(map, 4);
-
-    {  // get
-      DataDescriptor d(factory()->get_string(),
-                       JSAccessorPropertyDescriptor::kGetIndex, NONE,
-                       Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-    {  // set
-      DataDescriptor d(factory()->set_string(),
-                       JSAccessorPropertyDescriptor::kSetIndex, NONE,
-                       Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-    {  // enumerable
-      DataDescriptor d(factory()->enumerable_string(),
-                       JSAccessorPropertyDescriptor::kEnumerableIndex, NONE,
-                       Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-    {  // configurable
-      DataDescriptor d(factory()->configurable_string(),
-                       JSAccessorPropertyDescriptor::kConfigurableIndex, NONE,
-                       Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-
-    Map::SetPrototype(map, isolate()->initial_object_prototype());
-    map->SetInObjectProperties(4);
-    map->set_unused_property_fields(0);
-
-    native_context()->set_accessor_property_descriptor_map(*map);
-  }
-
-  // Create a map for data property descriptors (a variant of JSObject
-  // that predefines four properties value, writable, configurable and
-  // enumerable).
-  {
-    // DataPropertyDescriptor initial map.
-    Handle<Map> map =
-        factory()->NewMap(JS_OBJECT_TYPE, JSDataPropertyDescriptor::kSize);
-    // Create the descriptor array for the property descriptor object.
-    Map::EnsureDescriptorSlack(map, 4);
-
-    {  // value
-      DataDescriptor d(factory()->value_string(),
-                       JSDataPropertyDescriptor::kValueIndex, NONE,
-                       Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-    {  // writable
-      DataDescriptor d(factory()->writable_string(),
-                       JSDataPropertyDescriptor::kWritableIndex, NONE,
-                       Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-    {  // enumerable
-      DataDescriptor d(factory()->enumerable_string(),
-                       JSDataPropertyDescriptor::kEnumerableIndex, NONE,
-                       Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-    {  // configurable
-      DataDescriptor d(factory()->configurable_string(),
-                       JSDataPropertyDescriptor::kConfigurableIndex, NONE,
-                       Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-
-    Map::SetPrototype(map, isolate()->initial_object_prototype());
-    map->SetInObjectProperties(4);
-    map->set_unused_property_fields(0);
-
-    native_context()->set_data_property_descriptor_map(*map);
-  }
-
   // Create a constructor for RegExp results (a variant of Array that
   // predefines the two properties index and match).
   {