mm/vmscan: take all base pages of THP into account when race with speculative reference

If the page has buffers, shrink_page_list will try to free the buffer
mappings associated with the page and try to free the page as well.  In
the rare race with speculative reference, the page will be freed shortly
by speculative reference.  But nr_reclaimed is not incremented correctly
when we come across the THP.  We need to account all the base pages in
this case.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Miaohe Lin <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Huang, Ying <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Oscar Salvador <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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