FreeBSD/src d7aeb42 (r336314)sys/vm vm_pageout.c

Test PGA_REFERENCED after calling pmap_ts_referenced(), rather than before,
so that a reference from a concurrently destroyed mapping is observed
during the current scan.

Reviewed by:    kib, markj
MFC after:      1 week
Differential Revision:  https://reviews.freebsd.org/D16277
DeltaFile
+34-23sys/vm/vm_pageout.c
+34-231 files

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