[ARC] Fix warning in arc_return_address_register.

The if condition in arc_return_address_register which selects the arc
return address is not correct. The issue is signalized in bugzilla 85968.

gcc/
2018-06-15  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_return_address_register): Fix if-condition.

From-SVN: r261623

gcc/ChangeLog

+2018-06-15  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	PR target/85968
+	* config/arc/arc.c (arc_return_address_register): Fix
+	if-condition.
+
 2018-06-15  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/86159

gcc/config/arc/arc.c

@@ -9818,7 +9818,7 @@ arc_return_address_register (unsigned int fn_type)
 
   if (ARC_INTERRUPT_P (fn_type))
     {
-      if (((fn_type & ARC_FUNCTION_ILINK1) | ARC_FUNCTION_FIRQ) != 0)
+      if ((fn_type & (ARC_FUNCTION_ILINK1 | ARC_FUNCTION_FIRQ)) != 0)
         regno = ILINK1_REGNUM;
       else if ((fn_type & ARC_FUNCTION_ILINK2) != 0)
         regno = ILINK2_REGNUM;