mm: convert do_anonymous_page() to use a folio

Removes six calls to compound_head(); some inline and some external.

Link: https://lkml.kernel.org/r/20230116191813.2145215-3-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>