K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2017-06-18T00:08:38.130645Z
K 7
svn:log
V 237
arm: add .arch_extension sec for smc instruction

Clang 4.0 accepts the smc instruction with or without specifying
.arch_extension sec, but Clang 5.0 produces an error without it.

MFC after:	3 weeks
Sponsored by:	The FreeBSD Foundation

END