Revert of [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 e522bb58574e0142b5b656ac32ca1529a598c308..2472d45b7faf8eced8091f8205348530c80902b7 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1739,7 +1739,8 @@
 
   DCHECK(new_space_front == new_space_->top());
 
-  new_space_->SealIntermediateGeneration();
+  // Set age mark.
+  new_space_->set_age_mark(new_space_->top());
 
   ArrayBufferTracker::FreeDeadInNewSpace(this);
 
@@ -5090,6 +5091,7 @@
   }
 
   initial_semispace_size_ = Min(initial_semispace_size_, max_semi_space_size_);
+
   if (FLAG_semi_space_growth_factor < 2) {
     FLAG_semi_space_growth_factor = 2;
   }