Update XFAIL line after r294781.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@294820 91177308-0d34-0410-b5e6-96231b3b80d8

test/Driver/XRay/xray-instrument-cpu.c

 // RUN: not %clang -o /dev/null -v -fxray-instrument -c %s
-// XFAIL: amd64-, x86_64-, x86_64h-, arm, aarch64, arm64
+// XFAIL: amd64-, x86_64-, x86_64h-, arm, aarch64, arm64, powerpc64le-
 // REQUIRES: linux
 typedef int a;