Provide tagged allocation top pointer

test/cctest/heap/utils-inl.h

Index: test/cctest/heap/utils-inl.h
diff --git a/test/cctest/heap/utils-inl.h b/test/cctest/heap/utils-inl.h
index 0e943b4197538bccb7bd79c14c0bcd352a512177..9c59951f5a6b8d8fbc3c0f2baf91f88701d0de10 100644
--- a/test/cctest/heap/utils-inl.h
+++ b/test/cctest/heap/utils-inl.h
@@ -35,8 +35,7 @@ static inline std::vector<Handle<FixedArray>> CreatePadding(
   } else {
     heap->new_space()->DisableInlineAllocationSteps();
     int overall_free_memory =
-        static_cast<int>(*heap->new_space()->allocation_limit_address() -
-                         *heap->new_space()->allocation_top_address());
+        static_cast<int>(heap->new_space()->limit() - heap->new_space()->top());
     CHECK(padding_size <= overall_free_memory || overall_free_memory == 0);
   }
   while (free_memory > 0) {
@@ -48,8 +47,13 @@ static inline std::vector<Handle<FixedArray>> CreatePadding(
       length = LenFromSize(allocate_memory);
       if (length <= 0) {
         // Not enough room to create another fixed array. Let's create a filler.
-        heap->CreateFillerObjectAt(*heap->old_space()->allocation_top_address(),
-                                   free_memory, ClearRecordedSlots::kNo);
+        if (tenure == i::TENURED) {
+          heap->CreateFillerObjectAt(heap->old_space()->top(), free_memory,
+                                     ClearRecordedSlots::kNo);
+        } else {
+          heap->CreateFillerObjectAt(heap->new_space()->top(), free_memory,
+                                     ClearRecordedSlots::kNo);
+        }
         break;
       }
     }
@@ -67,8 +71,7 @@ static inline bool FillUpOnePage(
     v8::internal::NewSpace* space,
     std::vector<Handle<FixedArray>>* out_handles = nullptr) {
   space->DisableInlineAllocationSteps();
-  int space_remaining = static_cast<int>(*space->allocation_limit_address() -
-                                         *space->allocation_top_address());
+  int space_remaining = static_cast<int>(space->limit() - space->top());
   if (space_remaining == 0) return false;
   std::vector<Handle<FixedArray>> handles =
       CreatePadding(space->heap(), space_remaining, i::NOT_TENURED);
@@ -83,8 +86,7 @@ static inline void AllocateAllButNBytes(
     v8::internal::NewSpace* space, int extra_bytes,
     std::vector<Handle<FixedArray>>* out_handles = nullptr) {
   space->DisableInlineAllocationSteps();
-  int space_remaining = static_cast<int>(*space->allocation_limit_address() -
-                                         *space->allocation_top_address());
+  int space_remaining = static_cast<int>(space->limit() - space->top());
   CHECK(space_remaining >= extra_bytes);
   int new_linear_size = space_remaining - extra_bytes;
   if (new_linear_size == 0) return;