mm: swap: relaim the cached parts that got scanned

This commit implements reclaim during scan for cluster allocator.

Cluster scanning were unable to reuse SWAP_HAS_CACHE slots, which could
result in low allocation success rate or early OOM.

So to ensure maximum allocation success rate, integrate reclaiming with
scanning.  If found a range of suitable swap slots but fragmented due to
HAS_CACHE, just try to reclaim the slots.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Kairui Song <[email protected]>
Reported-by: Barry Song <[email protected]>
Cc: Chris Li <[email protected]>
Cc: "Huang, Ying" <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Kalesh Singh <[email protected]>
Cc: Ryan Roberts <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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