perf session: Remove superfluous callchain_cursor member

Since we have it in evsel->hists.callchain_cursor, remove it from
perf_session.

One more step in disentangling several places from requiring a
perf_session pointer.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-rxr5dj3di7ckyfmnz0naku1z@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 13bd5e0..d2f4303 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -50,7 +50,6 @@
 	int			cwdlen;
 	char			*cwd;
 	struct ordered_samples	ordered_samples;
-	struct callchain_cursor	callchain_cursor;
 	char			filename[0];
 };
 
@@ -100,7 +99,7 @@
 int perf_session__process_events(struct perf_session *self,
 				 struct perf_event_ops *event_ops);
 
-int perf_session__resolve_callchain(struct perf_session *self,
+int perf_session__resolve_callchain(struct perf_session *self, struct perf_evsel *evsel,
 				    struct thread *thread,
 				    struct ip_callchain *chain,
 				    struct symbol **parent);
@@ -169,7 +168,7 @@
 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
 					    unsigned int type);
 
-void perf_session__print_ip(union perf_event *event,
+void perf_session__print_ip(union perf_event *event, struct perf_evsel *evsel,
 				 struct perf_sample *sample,
 				 struct perf_session *session,
 				 int print_sym, int print_dso);