Fix missing info for -march and -mtune wrong values on aarch64 (PR driver/83193).

2018-02-20  Martin Liska  <mliska@suse.cz>

	PR driver/83193
	* config/aarch64/aarch64.c (aarch64_print_hint_for_core_or_arch): Print
	possible values if we don't have a hint.

From-SVN: r257844

gcc/ChangeLog

 2018-02-20  Martin Liska  <mliska@suse.cz>
 
+	PR driver/83193
+	* config/aarch64/aarch64.c (aarch64_print_hint_for_core_or_arch): Print
+	possible values if we don't have a hint.
+
+2018-02-20  Martin Liska  <mliska@suse.cz>
+
 	PR c/84310
 	PR target/79747
 	* final.c (shorten_branches): Build align_tab array with one

gcc/config/aarch64/aarch64.c

@@ -10633,6 +10633,9 @@ aarch64_print_hint_for_core_or_arch (const char *str, bool arch)
   if (hint)
     inform (input_location, "valid arguments are: %s;"
 			     " did you mean %qs?", s, hint);
+  else
+    inform (input_location, "valid arguments are: %s", s);
+
   XDELETEVEC (s);
 }