perf tools: Introduce new -P/--parent-deep report option

[Arnaldo Carvalho de Melo]

Hi Jiri,

	About the patch below, can't this be solved by using a regex
instead of a simple substring search instead of adding a new command
line option?

- Arnaldo

commit 5b42ff035ec784c5c42c4a6bb9e7fada882f097e
Author: Jiri Olsa <jolsa@xxxxxxxxxx>
Date:   Tue Jun 18 18:31:50 2013 +0200

    perf tools: Introduce new -P/--parent-deep report option
    
    Introducing new -P/--parent-deep report option. It does the
    same as '-p' but it force the deep search of the callchain
    and looks for the deepest possible match.
    
    The -p option searches for the first match of the parent
    pattern in the callchain.
    
      $ perf report -i perf.data.delete -p perf_session__delete -s parent
    
      +  99.51%  [other]
      +   0.46%  perf_session__delete_dead_threads
      +   0.03%  perf_session__delete
      +   0.00%  perf_session__delete_threads
    
    so we got multiple 'different' matches instancies, while
    they all belong under perf_session__delete function:
    
      $ perf report -i perf.data.delete -P perf_session__delete -s parent
    
      +  99.51%  [other]
      +   0.49%  perf_session__delete
    
    NOTE the 'p' vs 'P' difference in above commands above.

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