perf tests: Add a test case for cumulating callchains

Now it adds a new testcase to verify --children option working
correctly.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Arun Sharma <asharma@fb.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1401335910-16832-28-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

diff --cc tools/perf/Makefile.perf
Simple merge

diff --cc tools/perf/tests/builtin-test.c
Simple merge

diff --cc tools/perf/tests/hists_common.c
Simple merge

diff --cc tools/perf/tests/hists_cumulate.c
Simple merge

diff --cc tools/perf/tests/tests.h
Simple merge