[heap] Introduce a new remembered set for typed pointers from old to new.

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 1654 matching lines @@
     TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_ROOTS);
     IterateRoots(&scavenge_visitor, VISIT_ALL_IN_SCAVENGE);
   }
 
   {
     // Copy objects reachable from the old generation.
     TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_OLD_TO_NEW_POINTERS);
     RememberedSet<OLD_TO_NEW>::Iterate(this, [this](Address addr) {
       return Scavenger::CheckAndScavengeObject(this, addr);
     });
+
+    RememberedSet<OLD_TO_NEW>::IterateTyped(
+        this, [this](SlotType type, Address addr) {
+          return UpdateTypedSlotHelper::UpdateTypedSlot(
+              isolate(), type, addr, [this](Object** addr) {
+                return Scavenger::CheckAndScavengeObject(
+                    this, reinterpret_cast<Address>(addr));
+              });
+        });
   }
 
   {
     TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_WEAK);
     // Copy objects reachable from the encountered weak collections list.
     scavenge_visitor.VisitPointer(&encountered_weak_collections_);
     // Copy objects reachable from the encountered weak cells.
     scavenge_visitor.VisitPointer(&encountered_weak_cells_);
   }
 
@@ skipping 4674 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8