perf_counter tools: add in basic glue from Git

First very raw version at having a central 'perf' command and
a list of subcommands:

  perf top
  perf stat
  perf record
  perf report
  ...

This is done by picking up Git's collection of utility functions,
and hacking them to build fine in this new environment.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --cc Documentation/perf_counter/.gitignore
Simple merge

diff --cc Documentation/perf_counter/Makefile
Simple merge

diff --cc Documentation/perf_counter/PERF-BUILD-OPTIONS
Simple merge

diff --cc Documentation/perf_counter/PERF-CFLAGS
Simple merge

diff --cc Documentation/perf_counter/PERF-VERSION-FILE
Simple merge

diff --cc Documentation/perf_counter/PERF-VERSION-GEN
Simple merge

diff --cc Documentation/perf_counter/abspath.c
Simple merge

diff --cc Documentation/perf_counter/alias.c
Simple merge

diff --cc Documentation/perf_counter/builtin-help.c
Simple merge

diff --cc Documentation/perf_counter/builtin-top.c
Simple merge

diff --cc Documentation/perf_counter/builtin.h
Simple merge

diff --cc Documentation/perf_counter/cache.h
Simple merge

diff --cc Documentation/perf_counter/command-list.txt
Simple merge

diff --cc Documentation/perf_counter/config.c
Simple merge

diff --cc Documentation/perf_counter/ctype.c
Simple merge

diff --cc Documentation/perf_counter/exec_cmd.c
Simple merge

diff --cc Documentation/perf_counter/exec_cmd.h
Simple merge

diff --cc Documentation/perf_counter/generate-cmdlist.sh
Simple merge

diff --cc Documentation/perf_counter/help.c
Simple merge

diff --cc Documentation/perf_counter/help.h
Simple merge

diff --cc Documentation/perf_counter/levenshtein.c
Simple merge

diff --cc Documentation/perf_counter/levenshtein.h
Simple merge

diff --cc Documentation/perf_counter/parse-options.c
Simple merge

diff --cc Documentation/perf_counter/parse-options.h
Simple merge

diff --cc Documentation/perf_counter/path.c
Simple merge

diff --cc Documentation/perf_counter/perf.c
Simple merge

diff --cc Documentation/perf_counter/quote.c
Simple merge

diff --cc Documentation/perf_counter/quote.h
Simple merge

diff --cc Documentation/perf_counter/run-command.c
Simple merge

diff --cc Documentation/perf_counter/run-command.h
Simple merge

diff --cc Documentation/perf_counter/strbuf.c
Simple merge

diff --cc Documentation/perf_counter/strbuf.h
Simple merge

diff --cc Documentation/perf_counter/usage.c
Simple merge

diff --cc Documentation/perf_counter/util.h
Simple merge

diff --cc Documentation/perf_counter/wrapper.c
Simple merge