Tests: linux-trace logs return code with OOM note In case on the bug the replay was terminated with an empty stdout and signal handler wouldn't trigger, making it difficult to diagnose. This happened due to OOM killer (system low on memory) sending SIGKILL to the process, which can't be handled and results in termination with exit code -9. Add a note to the logs when this happens. Bug: angleproject:380296979 Change-Id: Id4db4b12c680701511430d90eee847baded03bcb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6042183 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>