perf annotate: Add symbol__calc_lines function

Replace symbol__get_source_line() with symbol__calc_lines(), which
calculates the source line tree over the struct annotation_line.

This will allow us to remove redundant struct source_line in following
patches.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20171011150158.11895-19-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/annotate.h

@@ -66,6 +66,7 @@ struct sym_hist_entry {
 
 struct annotation_data {
 	double			 percent;
+	double			 percent_sum;
 	struct sym_hist_entry	 he;
 };
 
@@ -78,6 +79,7 @@ struct annotation_line {
 	float			 ipc;
 	u64			 cycles;
 	size_t			 privsize;
+	char			*path;
 	int			 samples_nr;
 	struct annotation_data	 samples[0];
 };