Konstantin Belousov a36deee3d3 Use address space guard to implement inter-segment gap.
Rtld checks and use old MAP_ANON/PROT_NONE method of creating gap if
running on old kernel.

Reviewed by:	alc, markj
Tested by:	pho, Qualys
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2017-06-24 17:04:27 +00:00
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