Mark ARM subtarget features that are available for the assembler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117929 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/MC/ARM/neon-bitcount-encoding.s b/test/MC/ARM/neon-bitcount-encoding.s
index 1693711..85ebcc0 100644
--- a/test/MC/ARM/neon-bitcount-encoding.s
+++ b/test/MC/ARM/neon-bitcount-encoding.s
@@ -1,4 +1,4 @@
-// RUN: llvm-mc -triple arm-unknown-unkown -show-encoding < %s | FileCheck %s
+// RUN: llvm-mc -mcpu=cortex-a8 -triple arm-unknown-unkown -show-encoding < %s | FileCheck %s
 // XFAIL: *
 
 // CHECK: vcnt.8	d16, d16                @ encoding: [0x20,0x05,0xf0,0xf3]