Revert of Only use FreeSpace objects in the free list.

test/cctest/test-spaces.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 441 matching lines @@
     // Debug code can be very large, so skip CODE_SPACE if we are generating it.
     if (i == CODE_SPACE && i::FLAG_debug_code) continue;
     CHECK_EQ(1, isolate->heap()->paged_space(i)->CountTotalPages());
   }
 
   // No large objects required to perform the above steps.
   CHECK(isolate->heap()->lo_space()->IsEmpty());
 }
 
 
+static inline void FillCurrentPage(v8::internal::NewSpace* space) {
+  int new_linear_size = static_cast<int>(*space->allocation_limit_address() -
+                                         *space->allocation_top_address());
+  if (new_linear_size == 0) return;
+  v8::internal::AllocationResult allocation =
+      space->AllocateRaw(new_linear_size);
+  v8::internal::FreeListNode* node =
+      v8::internal::FreeListNode::cast(allocation.ToObjectChecked());
+  node->set_size(space->heap(), new_linear_size);
+}
+
+
 UNINITIALIZED_TEST(NewSpaceGrowsToTargetCapacity) {
   FLAG_target_semi_space_size = 2;
   if (FLAG_optimize_for_size) return;
 
   v8::Isolate* isolate = v8::Isolate::New();
   {
     v8::Isolate::Scope isolate_scope(isolate);
     v8::HandleScope handle_scope(isolate);
     v8::Context::New(isolate)->Enter();
 
@@ skipping 11 matching lines @@
 
       // Try to allocate out of the new space. A new page should be added and
       // the
       // allocation should succeed.
       v8::internal::AllocationResult allocation = new_space->AllocateRaw(80);
       CHECK(!allocation.IsRetry());
       CHECK(new_space->CommittedMemory() == 2 * Page::kPageSize);
 
       // Turn the allocation into a proper object so isolate teardown won't
       // crash.
-      HeapObject* free_space;
-      CHECK(allocation.To(&free_space));
-      new_space->heap()->CreateFillerObjectAt(free_space->address(), 80);
+      v8::internal::FreeListNode* node =
+          v8::internal::FreeListNode::cast(allocation.ToObjectChecked());
+      node->set_size(new_space->heap(), 80);
     }
   }
   isolate->Dispose();
 }