[heap] Revise memento check

Use AllocationMemento::kSize instead of HeapObject::kHeaderSize

Bug: v8:12612
Change-Id: Ieae62546f10c96fe5e5bcf98f9235f0c7ef7ff77
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3826248Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Auto-Submit: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82431}

src/heap/heap-inl.h

@@ -394,7 +394,7 @@ AllocationMemento Heap::FindAllocationMemento(Map map, HeapObject object) {
       // it, so suffices to compare ptr and top here.
       top = NewSpaceTop();
       DCHECK(memento_address >= new_space()->limit() ||
-             memento_address + HeapObject::kHeaderSize <= top);
+             memento_address + AllocationMemento::kSize <= top);
       if ((memento_address != top) && memento_candidate.IsValid()) {
         return memento_candidate;
       }