[heap] Ceanup: Remove weak cell scavenging code

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/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 1654 matching lines @@
                 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_);
   }
 
   {
     // Copy objects reachable from the code flushing candidates list.
     TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_CODE_FLUSH_CANDIDATES);
     MarkCompactCollector* collector = mark_compact_collector();
     if (collector->is_code_flushing_enabled()) {
       collector->code_flusher()->IteratePointersToFromSpace(&scavenge_visitor);
     }
   }
@@ skipping 4793 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8