Fix misspelled target triples in MC/ARM test commands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121901 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/MC/ARM/neon-dup-encoding.s b/test/MC/ARM/neon-dup-encoding.s
index 3af7fac..0aebdce 100644
--- a/test/MC/ARM/neon-dup-encoding.s
+++ b/test/MC/ARM/neon-dup-encoding.s
@@ -1,4 +1,4 @@
-@ RUN: llvm-mc -mcpu=cortex-a8 -triple arm-unknown-unkown -show-encoding < %s | FileCheck %s
+@ RUN: llvm-mc -mcpu=cortex-a8 -triple arm-unknown-unknown -show-encoding < %s | FileCheck %s
 @ XFAIL: *
 
 @ CHECK: vdup.8	d16, r0                 @ encoding: [0x90,0x0b,0xc0,0xee]