use auto_sbitmap in various places

gcc/ChangeLog:

2016-07-26  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* bt-load.c (compute_out): Use auto_sbitmap class.
	(link_btr_uses): Likewise.
	* cfganal.c (mark_dfs_back_edges): Likewise.
	(post_order_compute): Likewise.
	(inverted_post_order_compute): Likewise.
	(pre_and_rev_post_order_compute_fn): Likewise.
	(single_pred_before_succ_order): Likewise.
	* cfgexpand.c (pass_expand::execute): Likewise.
	* cfgloop.c (verify_loop_structure): Likewise.
	* cfgloopmanip.c (fix_bb_placements): Likewise.
	(remove_path): Likewise.
	(update_dominators_in_loop): Likewise.
	* cfgrtl.c (break_superblocks): Likewise.
	* ddg.c (check_sccs): Likewise.
	(create_ddg_all_sccs): Likewise.
	* df-core.c (df_worklist_dataflow): Likewise.
	* dse.c (dse_step3): Likewise.
	* except.c (eh_region_outermost): Likewise.
	* function.c (thread_prologue_and_epilogue_insns): Likewise.
	* gcse.c (prune_expressions): Likewise.
	(prune_insertions_deletions): Likewise.
	* gimple-ssa-backprop.c (backprop::~backprop): Likewise.
	* graph.c (draw_cfg_nodes_no_loops): Likewise.
	* ira-lives.c (remove_some_program_points_and_update_live_ranges): Likewise.
	* lcm.c (compute_earliest): Likewise.
	(compute_farthest): Likewise.
	* loop-unroll.c (unroll_loop_constant_iterations): Likewise.
	(unroll_loop_runtime_iterations): Likewise.
	(unroll_loop_stupid): Likewise.
	* lower-subreg.c (decompose_multiword_subregs): Likewise.
	* lra-lives.c: Likewise.
	* lra.c (lra): Likewise.
	* modulo-sched.c (schedule_reg_moves): Likewise.
	(optimize_sc): Likewise.
	(get_sched_window): Likewise.
	(sms_schedule_by_order): Likewise.
	(check_nodes_order): Likewise.
	(order_nodes_of_sccs): Likewise.
	(order_nodes_in_scc): Likewise.
	* recog.c (split_all_insns): Likewise.
	* regcprop.c (pass_cprop_hardreg::execute): Likewise.
	* reload1.c (reload): Likewise.
	* sched-rgn.c (haifa_find_rgns): Likewise.
	(split_edges): Likewise.
	(compute_trg_info): Likewise.
	* sel-sched.c (init_seqno): Likewise.
	* store-motion.c (remove_reachable_equiv_notes): Likewise.
	* tree-into-ssa.c (update_ssa): Likewise.
	* tree-ssa-live.c (live_worklist): Likewise.
	* tree-ssa-loop-im.c (fill_always_executed_in): Likewise.
	* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely):
	* Likewise.
	(try_peel_loop): Likewise.
	* tree-ssa-loop-manip.c (tree_transform_and_unroll_loop):
	* Likewise.
	* tree-ssa-pre.c (compute_antic): Likewise.
	* tree-ssa-reassoc.c (undistribute_ops_list): Likewise.
	* tree-stdarg.c (reachable_at_most_once): Likewise.
	* tree-vect-slp.c (vect_attempt_slp_rearrange_stmts): Likewise.
	* var-tracking.c (vt_find_locations): Likewise.

From-SVN: r238748

1 files changed, 1 insertions, 3 deletions

diff --git a/gcc/tree-ssa-live.c b/gcc/tree-ssa-live.c
index 15fc43f..72ee4e3 100644
--- a/gcc/tree-ssa-live.c
+++ b/gcc/tree-ssa-live.c
@@ -975,7 +975,7 @@ live_worklist (tree_live_info_p live)
 {
   unsigned b;
   basic_block bb;
-  sbitmap visited = sbitmap_alloc (last_basic_block_for_fn (cfun) + 1);
+  auto_sbitmap visited (last_basic_block_for_fn (cfun) + 1);
 
   bitmap_clear (visited);
 
@@ -990,8 +990,6 @@ live_worklist (tree_live_info_p live)
       b = *--(live->stack_top);
       loe_visit_block (live, BASIC_BLOCK_FOR_FN (cfun, b), visited);
     }
-
-  sbitmap_free (visited);
 }