Fix broken FileCheck prefixes

llvm-svn: 209538
diff --git a/llvm/test/CodeGen/ARM64/cse.ll b/llvm/test/CodeGen/ARM64/cse.ll
index d98bfd6..bb14c89 100644
--- a/llvm/test/CodeGen/ARM64/cse.ll
+++ b/llvm/test/CodeGen/ARM64/cse.ll
@@ -13,7 +13,7 @@
 ; CHECK: b.ge
 ; CHECK: sub
 ; CHECK: sub
-; CHECK_NOT: sub
+; CHECK-NOT: sub
 ; CHECK: ret
  %0 = load i32* %offset, align 4
  %cmp = icmp slt i32 %0, %size