K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2017-06-08T20:06:09.734736Z
K 7
svn:log
V 433
arm64: add ".arch armv8-a+crc" to allow use of crc instructions

With Clang 5.0 the .arch directive is required, otherwise Clang
complains "error: instruction requires: crc".

This was reported in D10499 but not added initially, because clang 3.8
available on a ref machine reported unknown directive.  Clang 4.0 allows
but does not require the directive.

Submitted by:	andrew
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation

END