gcov-tool: Mark {merge,rewrite}_usage with noreturn attribute

2019-06-10  Vladislav Ivanishin  <vlad@ispras.ru>

	* gcov-tool.c (merge_usage, rewrite_usage): Mark with
	ATTRIBUTE_NORETURN thus making consistent with overlap_usage.

From-SVN: r272119

gcc/ChangeLog

+2019-06-10  Vladislav Ivanishin  <vlad@ispras.ru>
+
+	* gcov-tool.c (merge_usage, rewrite_usage): Mark with
+	ATTRIBUTE_NORETURN thus making consistent with overlap_usage.
+
 2019-06-10  Jakub Jelinek  <jakub@redhat.com>
 
 	* tree.def (OMP_SCAN): New tree code.

gcc/gcov-tool.c

@@ -188,7 +188,7 @@ static const struct option merge_options[] =
 
 /* Print merge usage and exit.  */
 
-static void
+static void ATTRIBUTE_NORETURN
 merge_usage (void)
 {
   fnotice (stderr, "Merge subcomand usage:");
@@ -284,7 +284,7 @@ static const struct option rewrite_options[] =
 
 /* Print profile rewrite usage and exit.  */
 
-static void
+static void ATTRIBUTE_NORETURN
 rewrite_usage (void)
 {
   fnotice (stderr, "Rewrite subcommand usage:");