perf tools: Add pipe_test.sh to verify pipe operations

It builds a test program and use it to verify pipe behavior with perf
record, inject and report.

  $ perf test pipe -v
  80: perf pipe recording and injection test                          :
  --- start ---
  test child forked, pid 1109301
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
     1109315  1109315       -1 |test.file.MGNff
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
      99.99%  test.file.MGNff  test.file.MGNffM  [.] noploop
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
      99.99%  test.file.MGNff  test.file.MGNffM  [.] noploop
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.153 MB /tmp/perf.data.dmsnlx (3995 samples) ]
      99.99%  test.file.MGNff  test.file.MGNffM  [.] noploop
  test child finished with 0
  ---- end ----
  perf pipe recording and injection test: Ok

Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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