mm/slab: simplify freeing remote objects in free_to_pcs_bulk()

We have been moving remote objects to an on-stack array and flushing it
when full. Instead, we can swap them towards the beginning of the
supplied array and bulk-free it just once.

Also add a comment to explain the rationale of freeing remote objects
last, because now it would appear to be simpler to free them first.

Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Shengming Hu <hu.shengming@zte.com.cn>
Reviewed-by: Harry Yoo (Oracle) <harry@kernel.org>
Reviewed-by: Hao Li <hao.li@linux.dev>
Link: https://patch.msgid.link/20260713-bulk_free_remote-v2-1-24ee24771c2f@kernel.org
Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>

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