It was unused when added and the CHECK-ERROR lines
cover the possible outputs.
Reviewed By: ostannard
Differential Revision: https://reviews.llvm.org/D90913
// RUN: FileCheck %s --check-prefix=CHECK-ERROR
// RUN: not llvm-mc -triple aarch64-none-linux-gnu -show-encoding -mattr=+v8.4a,-tracev8.4 -o - %s 2>&1 | \
-// RUN: FileCheck %s --check-prefixes NOFEATURE,CHECK-ERROR
+// RUN: FileCheck %s --check-prefixes CHECK-ERROR
//------------------------------------------------------------------------------
// ARMV8.4-A Debug, Trace and PMU Extensions