FreeBSD/src a7751d3 (r351453)sys/vm vm_map.c

Make stack grow use the same gap as stack create.

Store stack_guard_page * PAGE_SIZE into the gap->next_read field at
the time of the stack creation.  This makes the used guard size
consistent between stack creation and stack grow time.

Suggested by:   alc
Reviewed by:    alc, markj
Sponsored by:   The FreeBSD Foundation
MFC after:      1 week
Differential revision:  https://reviews.freebsd.org/D21384
DeltaFile
+14-2sys/vm/vm_map.c
+14-21 files

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