gcc: xtensa: fix unused parameter warning

2017-05-28  Max Filippov  <jcmvbkbc@gmail.com>
gcc/
	* config/xtensa/xtensa.c (xtensa_initial_elimination_offset):
	Mark 'to' argument with ATTRIBUTE_UNUSED.

From-SVN: r248587

gcc/ChangeLog

 2017-05-29  Max Filippov  <jcmvbkbc@gmail.com>
 
+	* config/xtensa/xtensa.c (xtensa_initial_elimination_offset):
+	Mark 'to' argument with ATTRIBUTE_UNUSED.
+
+2017-05-29  Max Filippov  <jcmvbkbc@gmail.com>
+
 	* config/xtensa/xtensa.c (xtensa_emit_call): Use
 	HOST_WIDE_INT_PRINT_HEX instead of 0x%lx format string.
 	(print_operand): Use HOST_WIDE_INT_PRINT_DEC instead of %ld

gcc/config/xtensa/xtensa.c

@@ -2678,7 +2678,7 @@ xtensa_frame_pointer_required (void)
 }
 
 HOST_WIDE_INT
-xtensa_initial_elimination_offset (int from, int to)
+xtensa_initial_elimination_offset (int from, int to ATTRIBUTE_UNUSED)
 {
   long frame_size = compute_frame_size (get_frame_size ());
   HOST_WIDE_INT offset;