For non-prototype objects constructed using base==new.target, use the cached constructor to render …

src/heap/heap.cc

 // Copyright 2012 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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 2065 matching lines @@
   // Must be called only after |instance_type|, |instance_size| and
   // |layout_descriptor| are set.
   map->set_visitor_id(Heap::GetStaticVisitorIdForMap(map));
   map->set_bit_field(0);
   map->set_bit_field2(1 << Map::kIsExtensible);
   int bit_field3 = Map::EnumLengthBits::encode(kInvalidEnumCacheSentinel) |
                    Map::OwnsDescriptors::encode(true) |
                    Map::Counter::encode(Map::kRetainingCounterStart);
   map->set_bit_field3(bit_field3);
   map->set_elements_kind(elements_kind);
+  map->set_new_target_is_base(true);
 
   return map;
 }
 
 
 AllocationResult Heap::AllocateFillerObject(int size, bool double_align,
                                             AllocationSpace space) {
   HeapObject* obj = nullptr;
   {
     AllocationAlignment align = double_align ? kDoubleAligned : kWordAligned;
@@ skipping 4001 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8