perf trace: Add mmap2 handler

5c5e854b changed perf_event__synthesize_mmap_events to generate MMAP2
events. Since perf-trace does not have a handler for it it dies with a
segfault when trying to process files:

perf trace -i /tmp/perf.data
Segmentation fault
Signed-off-by: NDavid Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/1379900700-5186-4-git-send-email-dsahern@gmail.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-trace.c

@@ -1055,6 +1055,7 @@ static int trace__replay(struct trace *trace)
 
 	trace->tool.sample	  = trace__process_sample;
 	trace->tool.mmap	  = perf_event__process_mmap;
+	trace->tool.mmap2	  = perf_event__process_mmap2;
 	trace->tool.comm	  = perf_event__process_comm;
 	trace->tool.exit	  = perf_event__process_exit;
 	trace->tool.fork	  = perf_event__process_fork;