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 217c27b1349d40b1d2ea9d59357b86065804c376..ab82d2b74098fcabcb660a6cfa0c51f2185b837d 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1733,7 +1733,8 @@ void Heap::Scavenge() {
 
   DCHECK(new_space_front == new_space_->top());
 
-  new_space_->SealIntermediateGeneration();
+  // Set age mark.
+  new_space_->set_age_mark(new_space_->top());
 
   ArrayBufferTracker::FreeDeadInNewSpace(this);
 
@@ -5082,6 +5083,7 @@ 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;
   }