K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2018-09-14T15:29:35.680511Z
K 7
svn:log
V 196
amd64: implement pagezero_erms

Intel docs claim such a memset (rep stosb + 4096 bytes) is
special-cased by microarchs. They also switched Linux to use
it for this purpose.

Approved by:	re (gjb)

END