arc: Add length attribute to eh_return pattern.

gcc/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.md (eh_return): Add length info.

gcc/ChangeLog

+2020-03-03  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* config/arc/arc.md (eh_return): Add length info.
+
 2020-03-02  David Malcolm  <dmalcolm@redhat.com>
 
 	* doc/invoke.texi (-fanalyzer-show-duplicate-count): New.

gcc/config/arc/arc.md

@@ -6752,7 +6752,9 @@ core_3, archs4x, archs4xd, archs4xd_slow"
     arc_eh_return_address_location (operands[0]);
     DONE;
   }"
-)
+  [(set_attr "length" "8")]
+  )
+
 ;; include the arc-FPX instructions
 (include "fpx.md")