passes: Print a header in emergency_dump_function

Currently the emergency dump has no separation whatsoever from any
previous output in the dump file, making it harder than necessary
to find.


	* passes.c (emergency_dump_function): Print some empty lines and a
	header before the RTL dump.

From-SVN: r250481

gcc/ChangeLog

 2017-07-24  Segher Boessenkool  <segher@kernel.crashing.org>
 
+	* passes.c (emergency_dump_function): Print some empty lines and a
+	header before the RTL dump.
+
+2017-07-24  Segher Boessenkool  <segher@kernel.crashing.org>
+
 	* cfgrtl.c (rtl_dump_bb): Don't call NEXT_INSN on NULL.
 
 2017-07-24  Wilco Dijkstra  <wdijkstr@arm.com>

gcc/passes.c

@@ -1796,6 +1796,7 @@ emergency_dump_function ()
   if (!dump_file || !cfun)
     return;
   fnotice (stderr, "dump file: %s\n", dump_file_name);
+  fprintf (dump_file, "\n\n\nEMERGENCY DUMP:\n\n");
   execute_function_dump (cfun, current_pass);
 }