Mateusz Guzik 1b89d40fbf Revert "vm: use atomic fetchadd in vm_page_sunbusy"
This reverts commit f6ffed44a8eb5d1ab89a18e60fb056aab2105be7.

fetchadd will fail the waiters flag, which can cause other
code to wait when it should not with nothing clear it

Revert until I sort this out.

Reported by:	markj
2022-08-17 16:24:14 +00:00
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