Fix fwprop call to call to paradoxical_subreg_p

"mode" is the mode of "x", not the replacement value.

2019-06-06  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* fwprop.c (propagate_rtx): Fix call to paradoxical_subreg_p.

From-SVN: r272032

gcc/ChangeLog

+2019-06-07  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* fwprop.c (propagate_rtx): Fix call to paradoxical_subreg_p.
+
 2019-06-07  Martin Liska  <mliska@suse.cz>
 
 	* doc/invoke.texi: Remove param.

gcc/fwprop.c

@@ -680,7 +680,7 @@ propagate_rtx (rtx x, machine_mode mode, rtx old_rtx, rtx new_rtx,
       || CONSTANT_P (new_rtx)
       || (GET_CODE (new_rtx) == SUBREG
 	  && REG_P (SUBREG_REG (new_rtx))
-	  && !paradoxical_subreg_p (mode, GET_MODE (SUBREG_REG (new_rtx)))))
+	  && !paradoxical_subreg_p (new_rtx)))
     flags |= PR_CAN_APPEAR;
   if (!varying_mem_p (new_rtx))
     flags |= PR_HANDLE_MEM;