[PowerPC] mark xray test as unsupported on powerpcle in testsuite
Temporarily mark the test as unsupported so the powerpc le buildbot
testers can get back to work.
There was a brief discussion of this on the mailing list for r296998.
//
// At the time of writing, the ARM trampolines weren't written yet.
// XFAIL: arm || aarch64
+// See the mailing list discussion of r296998.
+// UNSUPPORTED: powerpc64le
#include "xray/xray_interface.h"
