K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2018-09-21T15:00:46.514638Z
K 7
svn:log
V 413
amd64: even up copyin/copyout with memcpy + other cleanup

- _fault handlers for both primitives are identical, provide just one
- change the copying scheme to match memcpy (in particular jump
avoidance for the most common case of multiply of 8)
- stop re-reading pcb address on exit, just store it locally (in r9)

Reviewed by:	kib
Approved by:	re (gjb)
Differential Revision:	https://reviews.freebsd.org/D17265

END