perf test: Name the noploop process

Name the noploop process "perf-noploop" so that tests can easily check
for its existence.

Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250628012302.1242532-1-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/tests/workloads/noploop.c

@@ -1,4 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+#include <pthread.h>
 #include <stdlib.h>
 #include <signal.h>
 #include <unistd.h>
@@ -16,6 +17,7 @@ static int noploop(int argc, const char **argv)
 {
 	int sec = 1;
 
+	pthread_setname_np(pthread_self(), "perf-noploop");
 	if (argc > 0)
 		sec = atoi(argv[0]);