gimple-loop-interchange.cc (struct induction): Rename fields.

gimple-loop-interchange.cc (struct induction): Rename fields.

2017-12-05  Bin Cheng  <bin.cheng@arm.com>

	* gimple-loop-interchange.cc (struct induction): Rename fields.
	(dump_induction, loop_cand::analyze_induction_var): Update uses.
	(loop_cand::undo_simple_reduction): Ditto.
	(tree_loop_interchange::map_inductions_to_loop): Ditto.
	(tree_loop_interchange::can_interchange_loops): Delete.
	(tree_loop_interchange::interchange): Inline can_interchange_loops.

From-SVN: r255419