perf test: Introduce script for data symbol testing

perf test: Introduce script for data symbol testing

The test is designed with a data structure with 64-byte alignment, it
has two fields "data1" and "data2", and other fields are reserved.

Using the "perf mem" command, we can record and report memory samples
for a self-contained workload with 1 second duration.  If no samples are
obtained for the data structure "buf1", it reports failure;  and by
checking the offset in structure "buf1", if the memory samples aren't
for the "data1" and "data2" fields, it means wrong data symbol parsing
and returns failure.

Committer testing:

  [root@quaco ~]# grep -m1 "model name" /proc/cpuinfo
  model name	: Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz
  [root@quaco ~]#
  [root@quaco ~]# perf test -v "data symbol"
  104: Test data symbol                                                :
  --- start ---
  test child forked, pid 192318
  Compiling test program...
  Recording workload...
  [ perf record: Woken up 2 times to write data ]
  [ perf record: Captured and wrote 0.389 MB /tmp/__perf_test.perf.data.LIuQl (5570 samples) ]
  Cleaning up files...
  test child finished with 0
  ---- end ----
  Test data symbol: Ok
  [root@quaco ~]#

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Link: https://lore.kernel.org/r/20221006101039.47870-1-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>