perf: Convert perf header build_ids into build_id events

Bypasses the build_id perf header code and replaces it with a
synthesized event and processing function that accomplishes the
same thing, used when reading/writing perf data to/from a pipe.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: k-keiichi@bx.jp.nec.com
Cc: acme@ghostprotocols.net
LKML-Reference: <1270184365-8281-9-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 0739ebb..0ac14d4 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -47,7 +47,8 @@
 		 unthrottle,
 		 attr,
 		 event_type,
-		 tracing_data;
+		 tracing_data,
+		 build_id;
 };
 
 struct perf_session *perf_session__new(const char *filename, int mode, bool force);