mm: use a folio in hugepage_add_anon_rmap() and hugepage_add_new_anon_rmap()

Remove uses of compound_mapcount_ptr()

Link: https://lkml.kernel.org/r/20230111142915.1001531-11-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>