Revert of Only use FreeSpace objects in the free list.

test/cctest/test-spaces.cc

Index: test/cctest/test-spaces.cc
diff --git a/test/cctest/test-spaces.cc b/test/cctest/test-spaces.cc
index d6668d7ce131f946c0549f0801e63a17a7e9c78a..a84b867f8de0ef387ad15d7bbdc02a95decaed40 100644
--- a/test/cctest/test-spaces.cc
+++ b/test/cctest/test-spaces.cc
@@ -459,6 +459,18 @@
 }
 
 
+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;
@@ -490,9 +502,9 @@
 
       // 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();