[heap] Remove border page

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 2472d45b7faf8eced8091f8205348530c80902b7..e522bb58574e0142b5b656ac32ca1529a598c308 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1739,8 +1739,7 @@ void Heap::Scavenge() {
 
   DCHECK(new_space_front == new_space_->top());
 
-  // Set age mark.
-  new_space_->set_age_mark(new_space_->top());
+  new_space_->SealIntermediateGeneration();
 
   ArrayBufferTracker::FreeDeadInNewSpace(this);
 
@@ -5091,7 +5090,6 @@ bool Heap::ConfigureHeap(int max_semi_space_size, int max_old_space_size,
   }
 
   initial_semispace_size_ = Min(initial_semispace_size_, max_semi_space_size_);
-
   if (FLAG_semi_space_growth_factor < 2) {
     FLAG_semi_space_growth_factor = 2;
   }