brooks 400fdc2b3b Indicate the brk/sbrk are deprecated and not portable.
More firmly suggest mmap(2) instead.

Include the history of arm64 and riscv shipping without brk/sbrk.

Mention that sbrk(0) produces unreliable results.

Reviewed by:	emaste, Marcin Cieślak
MFC after:	3 days
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D15535
2018-05-24 18:32:54 +00:00
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