Fix llvm-xray tests to avoid subshells

We already uses pipefail to detect failure of a redirected command, so
the "|| echo failure" construct was unnecessary.

These tests run and pass on Windows now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312747 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed