Revert of [heap] Remove border page

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 1715 matching lines @@
 
   promotion_queue_.Destroy();
 
   incremental_marking()->UpdateMarkingDequeAfterScavenge();
 
   ScavengeWeakObjectRetainer weak_object_retainer(this);
   ProcessYoungWeakReferences(&weak_object_retainer);
 
   DCHECK(new_space_front == new_space_->top());
 
-  new_space_->SealIntermediateGeneration();
+  // Set age mark.
+  new_space_->set_age_mark(new_space_->top());
 
   ArrayBufferTracker::FreeDeadInNewSpace(this);
 
   // Update how much has survived scavenge.
   IncrementYoungSurvivorsCounter(
       static_cast<int>((PromotedSpaceSizeOfObjects() - survived_watermark) +
                        new_space_->Size()));
 
   LOG(isolate_, ResourceEvent("scavenge", "end"));
 
@@ skipping 3328 matching lines @@
                      "semi-space size of %d MB\n",
                      max_semi_space_size_ / MB);
       }
     } else {
       initial_semispace_size_ =
           ROUND_UP(initial_semispace_size, Page::kPageSize);
     }
   }
 
   initial_semispace_size_ = Min(initial_semispace_size_, max_semi_space_size_);
+
   if (FLAG_semi_space_growth_factor < 2) {
     FLAG_semi_space_growth_factor = 2;
   }
 
   // The old generation is paged and needs at least one page for each space.
   int paged_space_count = LAST_PAGED_SPACE - FIRST_PAGED_SPACE + 1;
   max_old_generation_size_ =
       Max(static_cast<intptr_t>(paged_space_count * Page::kPageSize),
           max_old_generation_size_);
 
@@ skipping 1424 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8