perf tool: Add new event group management

hi,
adding support for creating event groups based on the way they
are specified on the command line.

This patchset adds the '{}' style grammar to express event group,
allowing so far only the 'event modifier' as group modifier.

The sample/leader modifier changes are ready, but I'm getting
some weird numbers in tests, so I'll send it later. Meanwhile,
it'd be nice to have at least this patchset in.. ;)


Attached patches:
  1/3 perf, tool: Add support to parse event group syntax
  2/3 perf, tool: Enable grouping logic for parsed events
  3/3 perf, test: Add automated tests for event group parsing

wbr,
jirka
---
 tools/perf/builtin-record.c         |   13 +--
 tools/perf/builtin-stat.c           |   13 +--
 tools/perf/builtin-test.c           |    8 +-
 tools/perf/builtin-top.c            |   12 +--
 tools/perf/util/evlist.c            |   20 ++---
 tools/perf/util/evlist.h            |    3 +-
 tools/perf/util/evsel.c             |   51 ++++++++----
 tools/perf/util/evsel.h             |   11 +--
 tools/perf/util/parse-events-test.c |  152 +++++++++++++++++++++++++++++++++++
 tools/perf/util/parse-events.c      |   32 +++++++-
 tools/perf/util/parse-events.h      |    5 +-
 tools/perf/util/parse-events.l      |    2 +
 tools/perf/util/parse-events.y      |   93 ++++++++++++++++++---
 tools/perf/util/python.c            |    7 +-
 14 files changed, 341 insertions(+), 81 deletions(-)
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