FreeBSD/src af00971 (r355763)sys/kern kern_exec.c, sys/vm vm_page.c

Handle pagein clustering in vm_page_grab_valid() so that it can be used by
exec_map_first_page().  This will also enable pagein clustering for other
interested consumers (tmpfs, md, etc).

Discussed with: alc
Approved by:    kib
Differential Revision:  https://reviews.freebsd.org/D22731
DeltaFile
+8-62sys/kern/kern_exec.c
+35-7sys/vm/vm_page.c
+43-692 files

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