MFC r258338: Grow UMA zone bucket size also on lock congestion during item free.
MFC r258338:
Grow UMA zone bucket size also on lock congestion during item free.

Lock congestion is the same, whether it happens on alloc or free, so
handle it equally.  Now that we have back pressure, there is no problem
to grow buckets a bit faster.  Any way growth is much slower then in 9.x.

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