[powerpc] Mark coverage-sample.cc as XFAIL on powerpc64le
When run this test case causes a segementation fault on powerpc64le.
The xfail should be removed when the problem is fixed.
//
// RUN: %clangxx_xray -std=c++11 %s -o %t
// RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false" %run %t | FileCheck %s
+// FIXME: When run this test case causes a segementation fault on powerpc64le.
+// Remove the xfail when the problem is fixed.
+// XFAIL: powerpc64le
#include "xray/xray_interface.h"
