perf test: Add debug line to diagnose broken metrics

Printing out the metric name and architecture makes finding the source
of a failure easier.

Signed-off-by: Ian Rogers <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: John Garry <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/pmu-events.c

···
 				break;
 			if (!pe->metric_expr)
 				continue;
+			pr_debug("Found metric '%s' for '%s'\n", pe->metric_name, map->cpuid);
 			err = metric_parse_fake(pe->metric_expr);
 			if (err)
 				return err;