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 e3e7607479bed4e6d7afb0d19a3924bd3c4d2d35..92ea2fb85a1c7875f5022da7fe71d27f5d65728b 100644
--- a/test/cctest/cctest.h
+++ b/test/cctest/cctest.h
@@ -486,27 +486,39 @@ static inline bool FillUpOnePage(v8::internal::NewSpace* space) {
   v8::internal::AllocationResult allocation =
       space->AllocateRaw(v8::internal::Page::kMaxRegularHeapObjectSize);
   if (allocation.IsRetry()) return false;
-  v8::internal::FreeListNode* node =
-      v8::internal::FreeListNode::cast(allocation.ToObjectChecked());
-  node->set_size(space->heap(), v8::internal::Page::kMaxRegularHeapObjectSize);
+  v8::internal::HeapObject* free_space;
+  CHECK(allocation.To(&free_space));
+  space->heap()->CreateFillerObjectAt(
+      free_space->address(), v8::internal::Page::kMaxRegularHeapObjectSize);
   return true;
 }
 
 
-static inline void SimulateFullSpace(v8::internal::NewSpace* space) {
-  int new_linear_size = static_cast<int>(*space->allocation_limit_address() -
+// 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() -
                                          *space->allocation_top_address());
-  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);
+  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)) {
   }
-  // Fill up all remaining pages.
-  while (FillUpOnePage(space))
-    ;
 }