perf report: Add --dsos parameter

So that we can filter by dso. Symbols in other dsos won't be
accounted for.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1246399282-20934-2-git-send-email-acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --cc tools/perf/Documentation/perf-report.txt
Simple merge

diff --cc tools/perf/Makefile
Simple merge

diff --cc tools/perf/builtin-report.c
Simple merge

diff --cc tools/perf/util/strlist.c
Simple merge

diff --cc tools/perf/util/strlist.h
Simple merge