Revert of Only use FreeSpace objects in the free list.

test/cctest/cctest.h

Index: test/cctest/cctest.h
diff --git a/test/cctest/cctest.h b/test/cctest/cctest.h
index 92ea2fb85a1c7875f5022da7fe71d27f5d65728b..e3e7607479bed4e6d7afb0d19a3924bd3c4d2d35 100644
--- a/test/cctest/cctest.h
+++ b/test/cctest/cctest.h
@@ -486,39 +486,27 @@
   v8::internal::AllocationResult allocation =
       space->AllocateRaw(v8::internal::Page::kMaxRegularHeapObjectSize);
   if (allocation.IsRetry()) return false;
-  v8::internal::HeapObject* free_space;
-  CHECK(allocation.To(&free_space));
-  space->heap()->CreateFillerObjectAt(
-      free_space->address(), v8::internal::Page::kMaxRegularHeapObjectSize);
+  v8::internal::FreeListNode* node =
+      v8::internal::FreeListNode::cast(allocation.ToObjectChecked());
+  node->set_size(space->heap(), v8::internal::Page::kMaxRegularHeapObjectSize);
   return true;
 }
 
 
-// Helper function that simulates a fill new-space in the heap.
-static inline void AllocateAllButNBytes(v8::internal::NewSpace* space,
-                                        int extra_bytes) {
-  int space_remaining = static_cast<int>(*space->allocation_limit_address() -
+static inline void SimulateFullSpace(v8::internal::NewSpace* space) {
+  int new_linear_size = static_cast<int>(*space->allocation_limit_address() -
                                          *space->allocation_top_address());
-  CHECK(space_remaining >= extra_bytes);
-  int new_linear_size = space_remaining - extra_bytes;
-  if (new_linear_size == 0) return;
-  v8::internal::AllocationResult allocation =
-      space->AllocateRaw(new_linear_size);
-  v8::internal::HeapObject* free_space;
-  CHECK(allocation.To(&free_space));
-  space->heap()->CreateFillerObjectAt(free_space->address(), new_linear_size);
-}
-
-
-static inline void FillCurrentPage(v8::internal::NewSpace* space) {
-  AllocateAllButNBytes(space, 0);
-}
-
-
-static inline void SimulateFullSpace(v8::internal::NewSpace* space) {
-  FillCurrentPage(space);
-  while (FillUpOnePage(space)) {
-  }
+  if (new_linear_size > 0) {
+    // Fill up the current page.
+    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);
+  }
+  // Fill up all remaining pages.
+  while (FillUpOnePage(space))
+    ;
 }