K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2018-11-08T15:12:36.981503Z
K 7
svn:log
V 297
amd64: align memset buffers to 16 bytes before using rep stos

Both Intel manual and Agner Fog's docs suggest aligning to 16.

See the review for benchmark results.

Reviewed by:	kib (previous version)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17661

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