[runtime] Set constructor field on preallocated maps.

src/bootstrapper.cc

 // Copyright 2014 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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
@@ skipping 1573 matching lines @@
                        NONE, Representation::Tagged());
       map->AppendDescriptor(&d);
     }
 
     {  // done
       DataDescriptor d(factory->done_string(), JSIteratorResult::kDoneIndex,
                        NONE, Representation::Tagged());
       map->AppendDescriptor(&d);
     }
 
+    map->SetConstructor(native_context()->object_function());
     map->SetInObjectProperties(2);
     native_context()->set_iterator_result_map(*map);
   }
 
   {  // -- W e a k M a p
     Handle<JSFunction> js_weak_map_fun = InstallFunction(
         global, "WeakMap", JS_WEAK_MAP_TYPE, JSWeakMap::kSize,
         isolate->initial_object_prototype(), Builtins::kIllegal);
     InstallWithIntrinsicDefaultProto(isolate, js_weak_map_fun,
                                      Context::JS_WEAK_MAP_FUN_INDEX);
@@ skipping 1177 matching lines @@
       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->SetConstructor(native_context()->object_function());
     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).
   {
@@ skipping 22 matching lines @@
       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->SetConstructor(native_context()->object_function());
     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).
   {
     // RegExpResult initial map.
@@ skipping 789 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8