bcache: Use a mempool for mergesort temporary space
It was a single element mempool before, it's slightly cleaner to just use a real
mempool.
Signed-off-by: 
Kent Overstreet <kmo@daterainc.com>
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It was a single element mempool before, it's slightly cleaner to just use a real
mempool.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>