[XRay][compiler-rt][NFC] Clean up xray log files before running test
Improves the test behaviour in the face of failure. Without this change
the fdr-single-thread.cc test may leave around artefacts of a previous
failing run since the cleanup doesn't happen if any of the intermediary
steps fail.
Non-functional change.
Subscribers: llvm-commits
// RUN: %clangxx_xray -g -std=c++11 %s -o %t
+// RUN: rm fdr-logging-1thr-* || true
// RUN: XRAY_OPTIONS=XRAY_OPTIONS="verbosity=1 patch_premain=true \
// RUN: xray_naive_log=false xray_fdr_log=true \
// RUN: xray_fdr_log_func_duration_threshold_us=0 \
