perf annotate: Make it to be able to skip unannotatable symbols

Add --skip-missing option for skipping symbols that cannot be used for
annotation.  It's the case of kernel symbols that user doesn't have a
vmlinux image file.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1360227734-375-8-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-annotate.txt

@@ -90,6 +90,9 @@ OPTIONS
 --objdump=<path>::
         Path to objdump binary.
 
+--skip-missing::
+	Skip symbols that cannot be annotated.
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-report[1]