Mark ARM subtarget features that are available for the assembler.

llvm-svn: 117929
diff --git a/llvm/test/MC/ARM/neon-dup-encoding.s b/llvm/test/MC/ARM/neon-dup-encoding.s
index 05380ca..557df2c 100644
--- a/llvm/test/MC/ARM/neon-dup-encoding.s
+++ b/llvm/test/MC/ARM/neon-dup-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: vdup.8	d16, r0                 @ encoding: [0x90,0x0b,0xc0,0xee]