rs6000.c (rs6000_internal_arg_pointer): Only return a reg rtx.

2018-01-30  Aaron Sawdey  <acsawdey@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_internal_arg_pointer): Only return
	a reg rtx.

From-SVN: r257193

gcc/ChangeLog

+2018-01-30  Aaron Sawdey  <acsawdey@linux.vnet.ibm.com>
+
+	* config/rs6000/rs6000.c (rs6000_internal_arg_pointer): Only return
+	a reg rtx.
+
 2018-01-30  Richard Biener  <rguenther@suse.de>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/config/rs6000/rs6000.c

@@ -29602,8 +29602,9 @@ rs6000_internal_arg_pointer (void)
 	  emit_insn_after (pat, get_insns ());
 	  pop_topmost_sequence ();
 	}
-      return plus_constant (Pmode, cfun->machine->split_stack_arg_pointer,
-			    FIRST_PARM_OFFSET (current_function_decl));
+      rtx ret = plus_constant (Pmode, cfun->machine->split_stack_arg_pointer,
+			       FIRST_PARM_OFFSET (current_function_decl));
+      return copy_to_reg (ret);
     }
   return virtual_incoming_args_rtx;
 }