perf c2c report: Add --no-source option

Add a possibility to disable source line column with new --no-source
option. It source line data could take lot of time to retrieve, so it
could be a performance burden for big data.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-8p6s2727fq8nbsm3it5gix3p@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>