[PATCH]: finish .cpu support for ARM

[Roman Divacky]

Hi,

The attached patch and test case finished support for .cpu for ARM.
We need this for FreeBSD kernel.

Thanks for reviewing!

Roman
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// RUN: llvm-mc -triple arm-gnueabi-freebsd11.0 %s | FileCheck %s
.cpu cortex-a8
dsb
.cpu arm9       
// CHECK: error: instruction requires: data-barriers
dsb
// CHECK: error: Unknown CPU name
.cpu foobar