Use Heap::CreateFillerArrayAt to create a filler instead of copied code.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index eb478846a3957d51c72b6264edf870f817d02189..0cd17917a6af909a23b006f83906820f5bfac787 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -2188,9 +2188,11 @@ void Heap::CreateFillerObjectAt(Address addr, int size) {
   if (size == 0) return;
   HeapObject* filler = HeapObject::FromAddress(addr);
   if (size == kPointerSize) {
-    filler->set_map(Heap::one_pointer_filler_map());
+    filler->set_map(one_pointer_filler_map());
+  } else if (size == 2 * kPointerSize) {
+    filler->set_map(two_pointer_filler_map());
   } else {
-    filler->set_map(Heap::byte_array_map());
+    filler->set_map(byte_array_map());
     ByteArray::cast(filler)->set_length(ByteArray::LengthFor(size));
   }
 }