perf mem: Fix -C option behavior for perf mem record

The -C/--cpu option was maily for report but it also affected record as
it ate the option. So users needed to use "--" after perf mem record to
pass the info to the perf record properly.

Check if this option is set for record, and pass it to the actual perf
record.

Before)
$ sudo perf --debug perf-event-open mem record -C 0 2>&1 | grep -a sys_perf_event_open
...
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 4
sys_perf_event_open: pid -1 cpu 1 group_fd -1 flags 0x8 = 5
sys_perf_event_open: pid -1 cpu 2 group_fd -1 flags 0x8 = 6
sys_perf_event_open: pid -1 cpu 3 group_fd -1 flags 0x8 = 7
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 8
sys_perf_event_open: pid -1 cpu 1 group_fd -1 flags 0x8 = 9
sys_perf_event_open: pid -1 cpu 2 group_fd -1 flags 0x8 = 10
sys_perf_event_open: pid -1 cpu 3 group_fd -1 flags 0x8 = 11
...

After)
$ sudo perf --debug perf-event-open mem record -C 0 2>&1 | grep -a sys_perf_event_open
...
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 4
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 5
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 6
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 7

Reported-by: Ravi Bangoria <[e-mail]>
Reviewed-by: Leo Yan <[e-mail]>
Signed-off-by: Namhyung Kim <[e-mail]>
Tested-by: Leo Yan <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-mem.c

···
 	else
 		rec_argc = argc + 9 * perf_pmu__hybrid_pmu_num();
 
+	if (mem->cpu_list)
+		rec_argc += 2;
+
 	rec_argv = calloc(rec_argc + 1, sizeof(char *));
 	if (!rec_argv)
 		return -1;
···
 
 	if (all_kernel)
 		rec_argv[i++] = "--all-kernel";
+
+	if (mem->cpu_list) {
+		rec_argv[i++] = "-C";
+		rec_argv[i++] = mem->cpu_list;
+	}
 
 	for (j = 0; j < argc; j++, i++)
 		rec_argv[i] = argv[j];