Fix warning in gcc.dg/plugin/expensive_selftests_plugin.c with !CHECKING_P

gcc/testsuite/ChangeLog:
	* gcc.dg/plugin/expensive-selftests-1.c: Update regexp to handle
	the !CHECKING_P case by expecting a note.
	* gcc.dg/plugin/expensive_selftests_plugin.c (plugin_init): Issue
	a note for the !CHECKING_P case, and move the return statement
	outside of #if CHECKING_P guard.

From-SVN: r256183

gcc/testsuite/ChangeLog

+2018-01-03  David Malcolm  <dmalcolm@redhat.com>
+
+	PR c/82050
+	* gcc.dg/plugin/expensive-selftests-1.c: Update regexp to handle
+	the !CHECKING_P case by expecting a note.
+	* gcc.dg/plugin/expensive_selftests_plugin.c (plugin_init): Issue
+	a note for the !CHECKING_P case, and move the return statement
+	outside of #if CHECKING_P guard.
+
 2018-01-03  Jeff Law  <law@redhat.com>
 
 	PR middle-end/83654

gcc/testsuite/gcc.dg/plugin/expensive-selftests-1.c

 int not_empty;
 
-/* { dg-regexp "expensive_selftests_plugin: .* pass\\(es\\) in .* seconds" } */
+/* { dg-regexp "expensive_selftests_plugin: .* pass\\(es\\) in .* seconds|not enabled in this build" } */

gcc/testsuite/gcc.dg/plugin/expensive_selftests_plugin.c

@@ -170,6 +170,8 @@ plugin_init (struct plugin_name_args *plugin_info,
 		     PLUGIN_FINISH,
 		     selftest::expensive_tests,
 		     NULL); /* void *user_data */
-  return 0;
+#else
+  inform (UNKNOWN_LOCATION, "self-tests are not enabled in this build");
 #endif /* #if CHECKING_P */
+  return 0;
 }