[ARC] Fix stack usage info for naked functions.

gcc/
2018-04-09  Alexey Brodkin <abrodkin@synopsys.com>

	* config/arc/arc.c (arc_expand_prologue): Set stack usage info
	also for naked functions.

From-SVN: r259238

gcc/ChangeLog

+2018-04-09  Alexey Brodkin  <abrodkin@synopsys.com>
+
+	* config/arc/arc.c (arc_expand_prologue): Set stack usage info
+	also for naked functions.
+
 2018-04-09  Claudiu Zissulescu  <claziss@synopsys.com>
 
 	* config/arc/arc.md (add_shift): New pattern.

gcc/config/arc/arc.c

@@ -3149,7 +3149,11 @@ arc_expand_prologue (void)
 
   /* Naked functions don't have prologue.  */
   if (ARC_NAKED_P (fn_type))
-    return;
+    {
+      if (flag_stack_usage_info)
+	current_function_static_stack_size = 0;
+      return;
+    }
 
   /* Compute total frame size.  */
   size = arc_compute_frame_size ();