make inverted_post_order_compute() operate on a vec

make inverted_post_order_compute() operate on a vec

gcc/ChangeLog:

2017-05-13  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* cfganal.c (inverted_post_order_compute): Change argument type
	to vec *.
	* cfganal.h (inverted_post_order_compute): Adjust prototype.
	* df-core.c (rest_of_handle_df_initialize): Adjust.
	(rest_of_handle_df_finish): Likewise.
	(df_analyze_1): Likewise.
	(df_analyze): Likewise.
	(loop_inverted_post_order_compute): Change argument to be a vec *.
	(df_analyze_loop): Adjust.
	(df_get_n_blocks): Likewise.
	(df_get_postorder): Likewise.
	* df.h (struct df_d): Change field to be a vec.
	* lcm.c (compute_laterin): Adjust.
	(compute_available): Likewise.
	* lra-lives.c (lra_create_live_ranges_1): Likewise.
	* tree-ssa-dce.c (remove_dead_stmt): Likewise.
	* tree-ssa-pre.c (compute_antic): Likewise.

From-SVN: r248027