Adding general performance benchmarking subcommand to perf.

This patch series add general benchmark subcommand to perf.

The subcommand will unify the benchmarking programs
and provide these in standardized way.

I fixed this series for latest tip tree.
My previous patch series conflicts with cmd_probe().
So please discard v4 and use this v5.

Hitoshi Mitake (7):
  Adding new directory and header for new subcommand 'bench'
  sched-messaging.c: benchmark for scheduler and IPC mechanisms based
    on hackbench
  sched-pipe.c: benchmark for pipe() system call
  builtin-bench.c: General framework for benchmark suites
  Modifying builtin.h for new prototype
  Modyfing perf.c for subcommand 'bench'
  Modyfing Makefile to build subcommand 'bench'

 tools/perf/Makefile                |    6 +
 tools/perf/bench/bench.h           |    9 +
 tools/perf/bench/sched-messaging.c |  332 ++++++++++++++++++++++++++++++++++++
 tools/perf/bench/sched-pipe.c      |  113 ++++++++++++
 tools/perf/builtin-bench.c         |  128 ++++++++++++++
 tools/perf/builtin.h               |    1 +
 tools/perf/perf.c                  |    1 +
 7 files changed, 590 insertions(+), 0 deletions(-)
 create mode 100644 tools/perf/bench/bench.h
 create mode 100644 tools/perf/bench/sched-messaging.c
 create mode 100644 tools/perf/bench/sched-pipe.c
 create mode 100644 tools/perf/builtin-bench.c

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